Another seat installation question ( aluminum ) Options

[FastFroggy]

Working my seat installation... I'm happy with the base mounts
(IMG:http://www.914world.com/bbs2/uploads_offsite/img.photobucket.com-19415-1488067033.1.jpg)
but struggling with the back support..
(IMG:http://www.914world.com/bbs2/uploads_offsite/img.photobucket.com-19415-1488067033.2.jpg)



Problem is that there really is not any space to even put your hands in let alone mark you spot.

But my basic question: which is preferred and why?

a. Should belt and seat back mount to firewall.
b. Should belt and seat back mount to roll bar ( i prefer this but I cannot figure a way to do this given the space available.).
c. Should belt to fire wall and seat back mount to roll bar.
d. Should belt to roll bar and seat back mount to firewall.

Please note that I have an eight paint roll cage.

[ThePaintedMan]

(IMG:style_emoticons/default/agree.gif) - rules vary per organization. However, I should note something that I feel is important. Unless the seat is specifically designed to be stand-alone with good side-mounts, i.e. most FIA-rated carbon seats, a proper seat back support should really be a consideration. Belts were designed to restrain the driver, but not the movement of a seat and driver combined. On an AX car, no biggie, but on the track, the speeds and forces are much, much greater in the event of an accident. I do believe that Kirkey specifically recommends a seatback brace with their seats as well.