I'm trying to locate a new set of mc28 sp fork tubes. I think mine are a little too pitted to re-chrome. Actually I would consider re-chroming if I could find a shop in US. I've spoken to a few and they seemed reluctant based on my description of the pits.

There is someone selling aftermarket tubes online, but ad says they are for '90 - '93 sp models. A quick check of the parts list shows last digits of -831 for those years. List for my bike shows -671 so I'm note sure if they are interchangeable.
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MC28 SP