It would be your standard 36-64 horseshoe. Going kick-only open-belt so no inner or outer primary to speak of, just an outer bearing support.Are you using the right oil tank.
need more info or apic of primary side and tank.
You don't need custom spacers. Take a measurement. Go to the hardware store look for a female pipe coupling 3/8ths or 1/2 " See how long they are. Close? Use a stainless washer as a shim if need be. If that doesn't work buy a short length of 1/2 pipe and cut to length in a chop saw. Dress it with a file. Think outside the box. Do you think all the bikers back in the 50's and 60's had instant access to a machine shop? It will be sanitary and only you need to know how you did it! Sometimes the coolest features are the result of necessity being the mother of invention.The main problem is the alignment of the tapped holes in the swingarm bosses and the holes in the tank bracketor, if i mount the bracket on the frame, then the alignment between the tank bracket holes on the bracket and the tank itself.
If I can get them to align, where would I find spacer material? Don't have access to a lathe.