There are several MB-only wrecking yards in CA with tons of vintage cars for parts. I would think you'd be able to track down whatever it is you're looking for. Sounds like a cool car! Good luck...

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)