These Trans-Dapt bolts are for use with Trans-Dapt Pulleys.
 
Part # ProductTube DiameterCapacityEngineExhaust System DiaFinishLengthMaterial Media
9490 CRANKSHAFT Pulley Bolts; 3/8"-24 x 1" (3 bolts per pkg.) Black Oxide1"Steel
Photo
$4.27
9491 CRANKSHAFT Pulley Bolts; 7/16-20 x 1" (3 bolts per pkg.) Black Oxide1"Steel
Photo
$3.20
9492 WATER PUMP Pulley Bolts (4 bolts per pkg.) Black OxideSteel
Photo
$3.37
 
http://hedman.com/images/ePIM/original/9490.jpg
http://hedman.com/images/ePIM/original/9491.jpg
http://hedman.com/images/ePIM/original/9492.jpg