Idler pulley is for the alternator belt. I believe the pulley numbers are, Crankshaft Pulley 481038 YB (for A/C) and 480509 XS (A/C belt pulley) and Water Pump Pulley 481040 XT. I only see a casting number on the aluminum piece 485991 (I have the complete set off a '73 motor).
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So long, farewell.
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