[Strobe]

Bill
I will post some photos but to answer some of your questions,

The springs are as metioned 600lbs running on the SPAX for the GT, uncompressed 197mm and 172 under load, spacer 20mm and 5 threads exposed to the lock nuts. Right now (because of speed bumps) I am running with tyre top 45mm beneath the wheel arch. Correct me if I am wrong but assuming you are running the tyres close to the edge you want very little compressive movement to avoid impacting the arch. Ths is kind of why I chose the 600lbs.....But the cost of springs wont prohibit changing as required.

The distance from the outside of the bevel on the knock on to the outside of the upper arch is 95mm from the same point from the knock on adapter to the inside wheel arch bulkhead is 270mm.
The distance from inside bulkhead to upper wheel arch inside is 365mm. The distance from the inside of the wheel to the inside arch is 80mm.

The car clearance I am running is 112mm and the tyres are 335/35 17's

Let me know what else you need
Steve