Exhaust O Rings Part Number

[250SLFranco]

I know this has been discussed before, but I find I need to replace the larger rubber O Rings used in the middle of my exhaust system and I have not been able to find the part number for those particular O Rings.  If anyone has the part number I need and a good vendor, I as usual, would certainly appreciate the help.  Thanks in advance.
250SLFranco

[Larry & Norma]

Any auto store will have a similar item much cheaper than Mercedes prices. I get mine from 'Halfords' here in the uk.
They work fine.

[250SLFranco]

I have the wrong size O rings on my exhaust system now, so that is why I need the part number or the correct size.  It has been identified that the center O Rings are larger that the rear O Rings.  Whoever worked on my exaust system (Midas Muffler) used the same size throughout.
Thanks