Foreign Car Parts in Upper Marlboro and one in Brandywine (family owned) have several 107/8, 124, 126, 210, 211, 140s and pretty new MBs (R129s). Have inventory and also you can just scavenge the yard and pull the parts you need.

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1987 300SDL 314K mi, counting; #22 Head
1999 E300Turbo 405K original miles
1997 E320 180K mi (Son's)
2002 ML320 (Son's)
1998 S320 140K mi (Son's) sold
1985 300SD 311K mi
1984 300D 324K mi (killed by a hit-n-run turd)
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