Use the sprocket carrier from the 4.5" wheel.
Both sprocket carriers start from the same casting, but the one for the 4.5" rim gets machined down more on the sprocket face, putting the chainline more inboard. If you have the two in your hand, you can see the difference. Chain runs close to the rear tire, but that's OK. Even light rubbing is acceptable (keeps your chain clean)
The 4.5" wheel was commonly on 5 speed engines, and the 5.5" wheels were on the 6 speed engines. The countershaft sprocket on the 6 speed sits a bit more outboard than the 5 speed. Hence the different sprocket carriers.
Usually cheap on e-bay, and often with a sprocket attached, and the spacers included.
Sorry, I don't know the part numbers.
Just a word of caution. Do you know about the odd wheel spacers on those wheel sets? The last one on the sprocket side mounts what appears to be backward. The big flat side touches the swing arm, and the cone side goes to the wheel to touch off on the ID of the bearing on the sprocket carrier. Lots of people get this wrong and ruin the swing arm and rear wheel bearings.
Cheers,
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