Dumb question -- would a '68 280 have 175's? There's a car in the cars for sale forum that is near me; you might talk the seller into parting with that piece, and I could pick it up for you. Check it out!

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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)