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Found this on Eriks, TNJ Murray also has them (overnite shipping?):
Belt For M35A3 Fan/Alternator, 12448759 / RCSK17002-2
Belt for M35A3 (CAT 3116 engine) used to drive the fan and alternator. p/n 12448759. NSN 3030014601030. OEM part, made in USA. Also replaces RCSK17002-2, 7PK1639.