im 6'4" and with a helmet on it mad it impossible for me to fit in my S13 with a fixed back bucket seat bottom mount.
easy and cheap soultion....
i cut the hump out of the floor under the drivers seat (must be running a test pipe in place of a cat to do this). welded a peice of sheet metal in place of the hole. used 1" square tubing to weld in place for my back mount used 2" x 1/8"? steel flat bar for the front mount. sat in the seat, marked/drilled the holes, and bolted it all up.
the top my shoulder now sits at the top of the door. i think i was able to drop the seat near 5" from the factory location. it cost me about 20 bucks in materials and about 2 hours. i taught myself to weld just prior to doing this, and it turned out great!
and as a bonus, you can correct the seat position. because (correct me if im wrong) the factory location is about 10 degrees off of center from the steering wheel in USDM 240's
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