Yes, the earlier bolts are shorter. The later bolts with pin pass through the carrier. Refer to parts diagrams posted by CAMN previously in this thread, (though the diagram does not show the hole). To use the longer bolt with pin, a hole would have to be drilled in the carrier on my Tenni. Another consideration; bolt w/o pin, $6.00 - improved bolt with pin, $42.00. Go figure!