Stock Seats and Cage/harnesses question

hey guys,

I want to get the seats for my scamp reupholstered, but before i lay down the cash im looking into the long run...I do plan to put a cage in the car one day (albeit when i run the required time, which could be sooner then later maybe) and i came across this peice form the nhra rulebook:

6.2 UPHOLSTERY, SEATS
The driver's seat of any car in competition must be constructed, braced, mounted, and upholstered so that it will give full back and shoulder support. The driver's seat must be supported on the bottom and back by the frame or crossmember. Except as noted in SFI specifications, seats must be bolted with four bolts (and nuts and washers) on the bottom and one bolt in the rear into crossbar; all bolts must go into frame or crossbraces, ball-pins for seat attachment prohibited. All seats must be upholstered, or as noted under Class or SFI Requirements. Properly braced, framed, supported and constructed seats of aluminium, fiberglass or double layer poly (accessory seats) or carbonfibre are permitted. Single layer fiberglass seats must have steel tube framework, 1/2-inch (12.7 mm) min outside diameter, for support. Aftermarket aluminium seats must have reinforced head rest. Magnesium seats prohibited.


Im wondering how you guys are following these rules and how you have routed your harnesses...did you cut holes through the headrests for shoulder belts? are your seatbacks bolted to the cage, and if they are can they still slide? i think pics would help out alot with this so if you guys have pictures of your cars with harnesses, cages and stock seats please share!

Thanks!
Matthew