[oldspeed]

uhh, am I missing something?

mount wheel on axle
make spacers to center
voila
don't see what the rockers have to do with it?

Rockers have different size holes, 74 springers were drilled larger than 45's. If the springer is a 45 they have the 5/8 in diameter hole that is perfect for a spool wheel, if it's a 74 springer then you need to make a stepped (sp) axle..