Correct Zinc plated alternator pulley nut. 11/16-20 thread 15/16" Hex . . .
THIS IS THE METAL REINFORCEMENT THAT MOUNTS IN FRONT OF PULLEY ON THE CRANK
Fits: 1964-76 Skylark GS Riviera Wildcat Electra . . .
1 groove pulley with 1386935SL stamped on pulley and is approximately 5 5/16” in diameter. . . .
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