RBS stocks a full inventory of grade 8 bolts for the coupler if the racer needs #500-5012 for a socket head allen bolt or #400-5012 for a twelve point.
Included with the coupler is an alum. spacer that is .450" thick to provide more driveshaft engagement if the racer needs. If unneeded take off and keep in the tool box.
Coupler looks to be new and never installed or run on a blower snout, customer traded spare parts in when blower combinations switched.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.