GUYS WHEN POSTING YOUR SUGGESTIONS MAKE SURE TO MENTION WHETHER YOU ACTUALLY HAVE USED THE SUGGESTED ITEM ON A HIBOY YOURSELF...
Faith,

I understand your concern, since any question on this board can get some "interesting" results. However, some folks don't need to have the exact application you have in order to solve your problem. Fitting a coilover is based on the same parameters regardless of the vehicle. I'm a coupe/sedan guy, so that's why I laid out the procedure rather than picking an application that I haven't used (roadster).

As to manufacturers, I've used QA1, Carrera and Aldan. I prefer the QAs and AldanEagles because they have adjustable valving.

I suggest that you take the measurements and post them. After that, call the tech line and see what they say, then compare notes here.