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Thanks for your response.
After doing some digging around and after the advice of a very helpful forum member, I now know they never made RHD rubber mats for the 463.
By all accounts, the W124 rubber mats are the closest fit from the OEM range.
Like your suggestion, I was going to have a crack at making my own, using the carpet set as a template. I only want them for the bad winter months :)