Is there such a thing as factory sbp 15" rims??

Ok guys I did some diggin round the homestead and came up with a set of 4 sbp rallys, they are in crummy shape and need some work, but I thought I would post pics to try and find out what size they are??? Im not sure if I am measuring from the right spots. I have heard both sides saying there is/isnt such a thing as 15" sbp

Thanks
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