There are no rubber rings. Rubber would not last 5 minutes in an exhaust system. There are rubber "O" shaped rings, but they are hangers, not seals.

If in doubt, get access to the EPC and type in your VIN and it will give you an exploded diagram of everything you need for your specific car. That should answer any and all questions you may have for your immediate needs!

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]