http://www.peachparts.com/shopforum/showthread.php?p=1144021#post1144021

If it's the R4 compressor (extrapolating from your name that the vehicle is a mid '80's diesel ), try a # 15-4710 or #15-4793 AC Delco. Common clutch (if that's it?) that fits 4,229 vehicles on the Delco website.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)