I have Cobra evolution seats in mine (head restraint seats are required in certain classes I run).
There was 2 different size options available (I'm 110kg) so I went for the larger width (GT I think they call it).
I purchased a set of universal side mounts which bolted directly to the seat (they have multiple height fitments), I fitted a set of universal slides to these mounts which allow the seat to slide back & forth as per oem, i then made a set of mounts (from 1" aluminium box section) that attach the slides to the floor.
With regard to the height I'm 6" & my seats are so low I have the s/wheel fully lowered. You could be 7" & sit in my car & still have headroom so seat height is no issue if you do it correctly. Hope this helps.
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Extremely helpful info Steve. Thanks for the pics too.
Hopefully make a few calls if I get time today....