S320CDI rear diff will have the larger 220 diff casing that the CL55 uses but will have the smaller inner flanges, you would have to swap in the set from you current diff that uses the larger flange so you can bolt the CL55 driveshafts onto them. The only other issue is the electronics; you will require an EGS controller that is used with a 3.07 diff for your gearbox to play ball. No coding is required. Happy wheel spinning!
