Structural Components & Rails for 2021 Cadillac XT4
No.
Part # / Description / Price
Price
1
Passenger Side Front Compartment Side Rail 
GM
GM Positions: Right
Description: Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $1,405.29
$922.75
MSRP $1,405.29
$922.75
2
Passenger Side Front Compartment Inner Side Rail Extension GM
GM Positions: Right
Notes: PARTS: Part included with rail assembly.
Description: Lower rail. Front center. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $80.03
$54.96
MSRP $80.03
$54.96
2
Driver Side Front Engine Compartment Inner Rail Extension GM
GM Positions: Left
Notes: PARTS: Part included with rail assembly.
Description: Lower rail. Front center. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $80.03
$54.96
MSRP $80.03
$54.96
3
Rail Assembly Upper Reinforced GM
GM Positions: Left
Notes: PARTS: Part included with rail assembly.
Description: 2021-23, lower rail. 2024-26, lower rail.
MSRP $31.13
$22.50
MSRP $31.13
$22.50
3
Rail Assembly Upper Reinforced GM
GM Positions: Right
Notes: PARTS: Part included with rail assembly.
Description: 2021-23, lower rail. 2024-26, lower rail.
MSRP $13.03
$9.42
MSRP $13.03
$9.42
4
Driver Side Front Compartment Side Rail GM
GM Positions: Left
Description: Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $565.06
$371.04
MSRP $565.06
$371.04
4
Passenger Side Front Compartment Side Rail GM
GM Positions: Right
Description: Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $649.76
$426.65
MSRP $649.76
$426.65
5
Outer Rail Bracket GM
GM Positions: Left
Notes: PARTS: Part included with outer rail.
Description: 2021-23, lower rail. 2024-26, lower rail.
MSRP $26.61
$18.22
MSRP $26.61
$18.22
5
Passenger Side Brake Hose Bracket GM
GM Positions: Right
Notes: PARTS: Part included with outer rail.
Description: Lower rail. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $47.13
$26.88
MSRP $47.13
$26.88
6
Front Passenger Side Wheelhouse Panel Extension GM
GM Positions: Right
Description: Front outer. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $87.17
$58.29
MSRP $87.17
$58.29
6
$50.02
7
Driver Side Front Compartment Inner Side Rail Extension GM
GM Positions: Left
Description: Lower rail, front inner. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $403.99
$266.49
MSRP $403.99
$266.49
7
Rail Extension GM
GM Positions: Right
Description: 2021-23, lower rail, front inner. 2024-26, lower rail, front inner.
MSRP $403.99
$266.49
MSRP $403.99
$266.49
8
Driver Side Floor Panel Number 1 Cross Bar Reinforcement GM
GM Positions: Left
Description: Center-lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $21.46
$15.52
MSRP $21.46
$15.52
8
Passenger Side Floor Panel Number 1 Cross Bar Extension GM
GM Positions: Right
Description: Center-lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $19.49
$14.09
MSRP $19.49
$14.09
9
Driver Side Front Compartment Outer Side Rail Extension GM
GM Positions: Left
Description: Lower rail, side upper. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $88.98
$59.50
MSRP $88.98
$59.50
9
MSRP $40.54
$27.84
10
Rail Extension GM
GM Positions: Right
Description: 2021-23, lower rail, side lower. 2024-26, lower rail, side lower.
MSRP $78.80
$54.12
MSRP $78.80
$54.12
10
Driver Side Front Compartment Side Rail Rear Extension GM
GM Positions: Left
Description: Lower rail, side lower. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $81.36
$55.87
MSRP $81.36
$55.87
11
Passenger Side Front Compartment Front Side Rail Reinforcement GM
GM Positions: Right
Description: Lower rail, #1. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $10.39
$7.51
MSRP $10.39
$7.51
11
Driver Side Front Compartment Front Side Rail Reinforcement GM
GM Positions: Left
Description: Lower rail, #1. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $28.50
$20.60
MSRP $28.50
$20.60
12
Driver Side Front Compartment Front Side Rail Reinforcement GM
GM Positions: Left
Description: Lower rail, #2. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $81.87
$56.22
MSRP $81.87
$56.22
12
Passenger Side Front Compartment Front Side Rail Reinforcement GM
GM Positions: Right
Description: Lower rail, #2. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $37.32
$25.63
MSRP $37.32
$25.63
13
Rail Assembly Lower Reinforced GM
GM Positions: Right
Description: 2021-23, lower rail, #3. 2024-26, lower rail, #3.
MSRP $17.68
$12.78
MSRP $17.68
$12.78
13
Driver Side Front Compartment Side Rail Rear Reinforcement GM
GM Positions: Left
Description: Lower rail, #3. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
MSRP $21.08
$15.24
MSRP $21.08
$15.24