more parts to identify

The adapters look like 5 bolt T hubs (5"BC) onto 5 bolt A wheels (5-1/2"BC). I had a set just like these years ago that JC Whitney provided.
I have a strange set (5) of 5" BC T wheels that take the '28/'29 hubcaps and not the standard '26/27 caps.
 
better view of the spacers. Found this info on the net. It was suggested to me that these may be for switching from T wood spoke to wire wheels.

These wheel adapters that will space your 5 lug 5" HUB pattern to a 5 lug 5" WHEEL pattern about 1" inch. SEMA approved and made from high grade heat-treated aluminum. Each adapter is approximately 1" thick.

That is no way to measure a bolt circle.
 
Take a piece of paper and cut out a 5" circle, and take another piece and cut out a 5-1/2" circle and lay them over the adapter and see how they line up. You will know that A and T items are used.
 
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