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OUTER HEAD BOLT BY SPARK PLUGS 3/8" WITH HEAVY TURNED WASHER
HEAD: HEX .525" A/F X .312 THICK & DOME
LENGTH UNDER HEAD: 2.343" (2 11/32")
BOLT SIZE: 3/8" X 26 TPI
MATERIAL: HI TENSILE STAINLESS STEEL
WASHER: 016213S
FITS: ALL HEAVYWEIGHT TWINS EXCEPT SOME ATLAS WITH 5/16" HEAD BOLTS
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