Originally Posted by
Bob Barry
Without doing any research, I would say the reason is 12mm vs 13mm. You need to collar to fit and I'm guessing the 13mm spring doesn't sit well on the 12mm collar
Well, the upper and lower collars I have on my shocks (2wd F.T.) were custom machined out of aluminum by a guy on this forum. So, I would suppose if he could make them 12mm wide, he could make them 13mm wide. I just am surprised nobody has been using the 13mm AE springs. Just seems like it would make more sense to keep it AE and to have spring rates that more closely match the SC10's stock springs better.