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How to Install Steeda Rear Seat X-Brace on your 2005-2014 Mustang Coupe

Installation Time

2 hours

American Muscle
Shop Parts in this Guide

Installation Instructions for #555-5085
• A qualified technician should be used if you are not confident with removing the rear seats.
• Refer to a factory service manual for additional guidance


Removal of the Factory Rear Seats 

1. Slide the front seats all the way forward. 

2. Release the tabs on the bottom of the rear seat bench. Seen in figure 1. Pull the front of the bench upward and and lift it out of the car. 

3. Remove the three pivot brackets forjhe backrests. There is one bracket in the center beneath the backrests, and one to the outside, near each seat belt. Each bracket has a 13mm head screw. See figure 2. 

4. Pull the cloth tab near the seat belt at the top of the backrests to release their hinges and remove the backrests. See figure 2. 

5. Unbolt the backrest strikers and set aside. There are two 10mm head screws securing each striker. 

6. Remove the seat bench brackets. Each bracket has two T50 Torx screws. See figure 2. 

7. Remove the seat belt buckles by removing the 15mm nut at each mount.  Note: For seat belt removal refer to a Ford factory service manual.



Assembly of the Steeda Rear Seat Chassis X-Brace 

8. If applicable, secure the dress-up plate to the X-brace with the provided screws and nuts. Use the longer screws and Nylon lock nuts on the center bolt holes. Use the shorter screws and standard nuts on the four corners. A small amount of Loctite is recommended for the shorter screws and non-locking nuts. 

9. Remove one of the two Torx screws from each of the rear seat bench brackets, for future use.

Installation of the Steeda X-Brace 

10. Install the brace as seen in figure 3. Reuse the four screws for the backrest striker and two of the Torx screws from the seat bench brackets. Torque the top mounts to 17 lb-ft and the bottom mounts to 20 lb-ft. You are done!


This guide applies to Vehicle years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 and Submodels: Boss 302, V6, Bullitt, GT, GT500