Hey - I live in denver, drive a 126 diesel but I know people with 123s. I was at pull and save today - Down to 1 or two 123s right now..
If you are intrested in finding some parts I know all the yards in the area and usually keep tabs on the ones with mercs. E-mail me and I can direct you them.

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4