Slingshot wheel into EFE standard arm

Evening folks.
Right, Iv'e got both types of Slingshot rear wheel, 4.5 and 5.5 inch and want to put one of them into a standard EFE swingarm. I trial fitted both today using the EFE cush drive in the 5.5 one and they are both at least half inch off centre and leave no room for a caliper carrier. I know the details were on OSS forum as a sticky and loads of people have done it. Does anyone have the answer for me?
Many thanks.
Cuds...
Right, Iv'e got both types of Slingshot rear wheel, 4.5 and 5.5 inch and want to put one of them into a standard EFE swingarm. I trial fitted both today using the EFE cush drive in the 5.5 one and they are both at least half inch off centre and leave no room for a caliper carrier. I know the details were on OSS forum as a sticky and loads of people have done it. Does anyone have the answer for me?
Many thanks.
Cuds...