I bought a new $35 fan clutch on ebay, but appeared to slip excessively after a few years. A junkyard one was cheap and seems to move more air. The 4 factory bolts require that you grind down a box wrench to fit. The flats are so small you risk rounding them off if you use an open-end wrench. I replaced w/ bolts w/ a larger head (from Ace drawers, "JIC large head" I recall) so an open wrench now works fine for me (search my post for PN).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans