I have the bk floor mounts (r-9044), oem side mounts and gt3 seats - gets the seat min 1" lower than sliders. I am 5'10" and have a huge noggin myself and am about 1/2" above broomstick with the oem rollbar if I sit straight. I keep the roof up just so that it isn't so obvious to the marshal.
precision chassis works (kpaz on this forum) makes a piece you can use if you cut out some of the seat mounting structure on the floor pan.
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