Let me add a question for folks that have done this - I have a hardtop but have yet to fit the spinlocks and bolts. I have Recaro Profi XL fixed back seats that are floor mounted and they are pretty far back. This is the only pic I have handy, but now both seats are the XL and mounted the same, in this pic I had the "regular" profi on the pax side.
I haven't started the install yet but I sure hope I don't have to remove the seats...
That is my step-daughter Kathryn, 15 in this picture.