Being I bit more tall than most of those around me at 6' 6", I've always had this issue where the rear view mirror obstructs part of my view. Sort of learned to deal with it. Not a big deal driving to work, but it did obstruct looking ahead through a turn on a road course or at an autocross. And having to use the sunroof space for helmet clearance, or leaning the seat back way too far. Not this time!
In order to get a new set of seats installed as low as possible (and I really wanted them as low as possible), I had to remove the stock rear floor pan mount for the seat. The front was usable as is, since I wanted the seat tilted back and it was at the right height. The rear however was too high and had a indentation in the middle:
It was quickly removed with a spot weld cutter and die grinder. Though I don't think I'll keep it, the removed part could be rewelded in. The piece does provide some floor pan rigidity, so I didn't want to just bolt the seat to the sheet metal. Probably wouldn't be as safe either. A new cross member was fabricated out of 1 1/2" square steel tubing with new welded captive nuts on the back. Now both the front and the rear are flat easy to bolt to surfaces, for my Neon seats, or any other seats down the road.
Stuck with the Neon seats for now because they were cheap, had no Dodge or Neon logos or anything, were pretty comfortable and had nice bolsters, and just as important, had nice flat bottom seat sliders, so they were easy to mount and I could keep a forward/backward sliding adjustment:
Cut off the stock brackets and made a new set out of 1/8" mild steel. The triangular pieces on the front bracket are lighter weight (1/16") and are primarily just to have a flat surface to bolt to. The main part of the bracket is solid 1/8" through to the seat and welded and bolted to the seat. They should be just as strong as the ones that came off. The stock seat belts were able to be bolted directly to the frame.
And both installed. I can easily see under the mirror and fit with a helmet on, despite the sunroof!