This guy supplies most of the big names out there,
Cobraracing Racing Suspensions
Great parts, send the Kirkhams an email with your car's number they would be the best to ask. I would think you will need to change out just about every thing from the frame out to convert to the steel tube control arms, I have a Hi Tech, a Kirkham, and CSX car in the shop and they are close but all have there little differences.
I have 3 types of CSX control arms, 2 types of Hi Tech control arms and 2 sets of steel Kirkhams control arms as well as there alloy arms and I can tell you no 2 are the same.
Cheers.