GM 6.5" Thermal Fan Clutch, 1 15/16" OC, NOS C08A, Many Applications. See pics for more details. The fan mount looks to be 3.25" OC and 1 15/16" for the water pump mount.
64-68 Pontiac GTO OEM Factory Style Thermal Fan Clutch GM 9786404 & 9790972 New
1971 1972 1973 CHEVY IMPALA CAPRICE JIMMY BLAZER THROTTLE CABLE NOS GM 725
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Four Seasons 36706 Thermal Fan Clutch