Maybe i'm really stupid or something but i can't find any rear coil overs in the u.s.. My car will have a 6 speed g-50, heavy water-cooled 4 cylinder engine, and sit on 18X10's in the rear with 6 pot cayenne brakes front and rear(pics coming as soon as lanner@vdubcustoms gets the parts back to me)... So, it'll be heavier than most std irs beetles. I'm thinking a 350 pound spring rate. I ultimately only want to use bilstein, but I want the shocks to be adjustable, bound, rebound, and ride height. If anyone knows of a coil over that compares to bilstein...any coil over that i can use in the rear of my 400 hp, heavy 74' std beetle, that would be the best news i've had in a long time.
Please let me know of any distributors on american soil that can provide some suspension modifications for my beetle 
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P.S. The car will have no interior, lexan, no rear seat, full cage, and i want it to HANDLE.