Thats not true. My 96 9c1 has 94-96 ss wheels that came on my 95 civi. The civi now has alloys and uses police package steelies in the winter. '90 to '91-'06 are the only difference I think. So, all bubble caprice wheels are interchangeable with the SS. The SS does not have the same rear as a 9C1. It has the same gear ratio,and G80 was also an option, but the carriers are different by 5/8 inch width on both sides. 9C1 rears are narrow to fit snow chains for municipal use.
1988 9C1 ex PASP LM1 350, 3.08, manual interior
1996 9C1 ex L.A. MTA/LASD CSD #SD/R01413,~ LT1, lowered, G80 3.08, tubular extended arms, cowl hood,K&N, 7X7, console shifter,prisoner locks, manual interior, Flowmaster 17" AMRs, tune +more