Well I just answered my own question with a test fit. I installed the 1g DSM spring perch on one strut and what I believe to be the stock CSM spring perch without the raised indent on the other strut. 1g DSM spring perch hits the inner fender well when turning right. CSM spring perch allows free movement. I'll take a closer look at the DSM perch when I remove it to see if it is more oval shaped compared to the CSM perch that looks pretty much circular.
Anyone have 3 stock upper spring perches from a C50 chassis laying around?