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The '81 seat tracks will not fit the '75 floor pan. If you look at the front of the '81 tracks, you will see a bracket about 1.5 " tall. I used my '75 tracks, made a spacer and used a longer Grade 8 bolt for the front of the seat. Had to trim a little bit of the seat bucket to clear the adjustment lever (invisible with the seat in the car).
Steve G. I like the looks of your 75 convertible. I have one as well which I am refreshing to be a nice driver and to take to local car shows. I see you have done several modifications to the car. I would like to know what you have done. Particularily to the engine and suspension. Have you done anything to stiffen up the frame or body?