Structural Components & Rails for 2018 Buick Regal Sportback
No.
Part # / Description / Price
2
Driver Side Front Compartment Side Rail Bracket 
GM
MSRP $13.84
GM Rail Assembly Front Bracket, Left
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
4
Driver Side Front Engine Compartment Inner Rail Extension GM
MSRP $80.03
GM Rail Assembly Front Extension, Left
Lower rail. Front center. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
4
Passenger Side Front Compartment Inner Side Rail Extension GM
MSRP $80.03
GM Rail Assembly Front Extension, Right
Lower rail. Front center. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
4
Front Passenger Side Wheelhouse Panel Extension GM
MSRP $87.17
GM Frame Side Member Reinforcement, Front right outer
Front outer. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
4
Rail Extension GM
MSRP $72.84
GM Frame Side Member Reinforcement, Front left outer
2024-26, lower rail, front outer.
5
Rail Assembly Upper Reinforced GM
MSRP $31.13
GM Rail Assembly Upper Reinforced, Left
2021-23, lower rail. 2024-26, lower rail.
5
Rail Assembly Upper Reinforced GM
MSRP $13.03
GM Rail Assembly Upper Reinforced, Right
2021-23, lower rail. 2024-26, lower rail.
6
Driver Side Front Compartment Side Rail Rear Reinforcement GM
MSRP $21.08
GM Rail Assembly Lower Reinforced, Left
Lower rail, #3. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
6
Rail Assembly Lower Reinforced GM
MSRP $17.68
GM Rail Assembly Lower Reinforced, Right
2021-23, lower rail, #3. 2024-26, lower rail, #3.
8
Driver Side Underbody Rear Side Rail GM
MSRP $182.87
GM Frame Rail End, Rear left
Sportback, 5-link suspension. Tourx. Helps strengthen and support your vehicle's underbody This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors . Collision parts are designed to help promote proper and safe repair
8
Driver Side Underbody Rear Side Rail GM
MSRP $136.45
GM Frame Rail End, Rear left
Sportback, 4-link suspension. Helps strengthen and support your vehicle's underbody This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Collision parts are designed to help promote proper and safe repair
9
Driver Side Front Engine Compartment Inner Rail Extension GM
MSRP $79.13
GM Rail Extension, Left
Front inner. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
9
Passenger Side Front Compartment Inner Side Rail Extension GM
MSRP $79.13
GM Rail Extension, Right
Front inner. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
9
Driver Side Front Compartment Front Side Rail Reinforcement GM
MSRP $31.41
GM Frame Side Member Reinforcement, Front left inner
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
11
Driver Side Floor Panel Number 1 Cross Bar Reinforcement GM
MSRP $21.46
GM Rail Extension, Left
Center-lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
11
Passenger Side Floor Panel Number 1 Cross Bar Extension GM
MSRP $19.49
GM Rail Extension, Right
Center-lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
12
Driver Side Front Compartment Outer Side Rail Extension GM
MSRP $27.12
GM Rail Extension, Left
Lower rail, side upper. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
12
Passenger Side Front Compartment Outer Side Rail Extension GM
MSRP $26.34
GM Rail Extension, Right
Lower rail, side upper. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
13
Driver Side Front Compartment Side Rail Rear Extension GM
MSRP $52.71
GM Rail Extension, Left
Lower rail, side lower. Rear lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
13
Passenger Side Front Compartment Side Rail Rear Extension GM
MSRP $48.90
GM Rail Extension, Right
Lower rail, side lower. Rear lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
14
Driver Side Front Engine Compartment Front Rail Reinforcement GM
MSRP $31.87
GM Rear Reinforced, Left
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
14
Passenger Side Front Compartment Front Side Rail Reinforcement GM
MSRP $25.88
GM Rear Reinforced, Right
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
15
Driver Side Front Compartment Outer Side Rail GM
MSRP $46.35
GM Outer Rail, Left
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
15
Passenger Side Front Compartment Outer Side Rail GM
MSRP $47.08
GM Outer Rail, Right
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
16
17
Underbody Rear Side Rail GM
GM Floor Side Rail, Rear left
Sportback, 5-link suspension. Tourx. Helps strengthen and support your vehicle's underbody This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors . Collision parts are designed to help promote proper and safe repair
17
Rear Underbody Side Rail GM
MSRP $56.97
GM Floor Side Rail, Rear left
Sportback, 4-link suspension. Helps strengthen and support your vehicle's underbody This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors . Collision parts are designed to help promote proper and safe repair
19
Driver Side Front Compartment Side Rail Bracket GM
MSRP $9.26
GM Rear Rail Center Bracket, Left
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
20
Passenger Side Front Compartment Front Side Rail Reinforcement GM
GM Front Reinforced, Right
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
21
Driver Side Front Compartment Side Rail Plate GM
MSRP $10.39
GM Front Reinforced Plate, Left
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
21
Passenger Side Front Compartment Side Rail Plate GM
MSRP $10.16
GM Front Reinforced Plate, Right
Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
22
Passenger Side Front End Sheet Metal Diagonal Brace Reinforcement GM
MSRP $11.35
GM Diagonal Brace, Right
Lower rail. Helps reinforce and align your vehicle's radiator support panel reinforcement This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
22
Driver Side Front End Sheet Metal Diagonal Brace Reinforcement GM
MSRP $11.19
GM Diagonal Brace, Left
Lower rail. Helps reinforce and align your vehicle's radiator support panel reinforcement This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors