15 and 30 cwt both used 16 inch rims and to the best of my knowledge, the same studs (almost flush on the innner face). The 60 cwt and FAT used 20 inch that had mushroom headed studs. Feel free to post the dimensions from your best studs for our benefit. When you find a modern source there will be many appreciative CMP owners. Even better if the source has branches in North America, Europe and Australia and elsewhere so we don't have to pay large for shipping, handling, Customs etc.
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