I don't actually know the answer to that question. See the attached photos for comparison the Ray Chang resin-molded Y with his rim compared to mine, which looks to be about 1mm smaller in diameter, but which "fits" the actual Tamiya Panzerspahwagen 8rad piece better as the mount for the upper turret guns. So this is Part #30 on the AMT 1/25 Fruehauf Shell Tanker truck, which is in re-issue at the moment and all over the hobby shops. As you can see from the second pic, its an inner wheel rim piece, with a wider middle section than the two outer sections -- I've cut off the lower outer section, and it matches in height the Ray Chang resin molded identical piece. It also, to my eye, both fits the original 8rad piece better as the gun mount, and also looks better on top of the canopy because it takes up slightly less real estate. For the other question, no, I don't think it is the same rim used for the rear of the Y-Wing, and using DaveG's measurements/body fuselage you can see that in order to get the narrower outer section of that rim inserted into the rear hole, I have to split the body open by a few mm. So I'm pretty sure that was a different rim from a different vehicle, and I don't have that information yet -- if any of you do, please share. The very last picture is the Fruehauf rim directly on top of the resin-molded rim by Ray Chang and you see that the Fruehauf is about 1mm less in total diameter all the way around. The outer diameter of the Fruehauf tanker upper/outer rim is 2cm.
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Also, someone more computer savvy than me, please tell me what I'm doing wrong in posting pictures -- on my "Edit" screen all eight images are up and live, but once I hit save/post they all become "links" and they all become "Invalid Attachment specified. If you followed a valid link, please notify the
administrator" -- please help my computer illiteracy to fix this. Thanks!