hey mate...

funny you ask these questions as I've asked them not so long ago:

any type of cage can only be installed to a car which is registered as a two seater (no rear seats) - be it a 4pt or a 6pt. The only issue with a 6pt cage is that in some states its not approved for street use (track only) - thefore a good idea to maybe have it engineered in such a way that you can 'add' those two front points before a track outing.

I have a CUSCO 6pt cage at home which is actually made for an ED/EF (which im considering modifying) to fit my gen1. this cage allows me to add the two front legs when i go racing.