65 barracuda drum size

Hey, can somwone let me know the drum size.
From one side to another in the smallwr ring its 10.4 ish so does it round down to a 10 inch drum?
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View attachment 1716011908Couldn’t find mine so a copied a pic from the web. I think I loaned it out.

Hey, can somwone let me know the drum size.
From one side to another in the smallwr ring its 10.4 ish so does it round down to a 10 inch drum?
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Just for future reference the spindles pictured are 10 inch spindles, 9 inch have the upper ball joint stud boss twisted 90 degrees.