Order some extra, they're cheap. I messed up the first couple I did and had to run out and buy replacements. Its easier with several MB dealers within a couple of miles, but in your case it might be worth the extra cost to have an extra on hand.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic