Farmall 100/ Super A/ A rear wheels??

'T other day I pulled front loader off my little Farmall 100, pulled the final drives and replaced the brakes. I have an A? super A? rolling chassis I junked, and was going to put the heavy cast RH wheel off the junker onto the 100 LEFT side. The bolt pattern is the same but the center hole is too small!!

I haven't yet measured the original--difficult to get a caliper in there with it "offset out," anyone know is this by intention, or a difference between the A series and 100?
 
Something is funny as the cast should fit either side and all A and B tractors but i havent tried to put one an a 100 from an A. I did run a problem once had to remove some burs once to get it to git.I dont know where the cast center had came from but i was putting it on an A.
 
I finally took the caliper out, and due to rust it's difficult to get a very accurate measurement, but there is NO DOUBT that the left/ right hub sizes are different.

The RH side with the cast wheel measures nom. 4.62" while the LH stamped steel side measures nom 4.75. This is true both on the junker and the 100

I did look things over, though, and it appears I'll be able to install the cast wheel "as a weight" by using the weight attachment holes through both wheels. I'll then stack the two rear weights onto the RH side
 

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