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I made brackets just as filmsurgeon posted, I made them 2" from hole to hole so I would gain 2" in seat placement.

Well it all seemed like a good idea but their is a problem. You can not slide the seat back that much further because it hits the seat belt retractor. I think all I gained was about 1" until it the retractor. Looks like I am going to have to go to a smaller wheel.......



I understand you are rebuilding a 1971. If so, just make a new backing plate with bolt hole. Weld to bottom of floorpan two inchs farther back. That is what I did.

Now if it is a 1970 with the plastic covers, a lot more difficult, especially if it has carpet already.

On my 1971 cuda we cut the floor board and moved the whole section back 3 inches. The part that was removed we welded in front of seat area. Worked great. I can now drive from near the back seat if so desired.

On my 1970 cuda I will have to make some more modifications because of what you say. Good luck.