RBS carries these billet alum. coupler spacers that will go between the blower snout coupler and blower gear and space the snout coupler out .750". Included is grade eight 5/16-24" mounting hardware.
The racer must measure the register on there blower gear and check and see if it is 1.250" or 1.50" to pick the correct coupler spacer.
Spacer has a male register for the coupler to register on to keep everything running concentric inside the front of the blower.
Racer can pick gear register size to get the correct part from the drop down menu.