OK thanks for your help. I understand you can only give me the info you have and been very nice to provide it. The reason I was hoping to get an answer by using the 36418 casting number was the post below I found on this thread:

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Post:
"So shoes are 2 7/8 wide
drums have a part number 36418 also mwyb5 c21.
Found out they are 11x3 from factory on rear. "

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I was hoping for confirmation being that he has the same casting number as me and he is sure his are 11x3, that would mean mine are that size too. (again remember this is not about if its factory correct or not but instead just what is on my car which I can't access due to it being in storage and need to order brake shoes etc for).

In your opinion, being mine is the same casting number would it likely have to also be the same 11x3 size? (I would assume you can't have the same casting number on 11x3 and 11x2.5 parts, no?) I promise this to be the last question regarding this. Thanks.