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Dura Ace 7800 Triple chainring replacement

I've got an old Dura Ace triple 7800 which could do with some new chainrings. The outer is no great problem, it's a 130 bcd which I can just use a standard double chainring. The inner ring isn't very worn, so doesn't need to be replaced, but this is bolted to the middle ring. I doubt I'll be able to get a new one of these, so does anyone know of an alternative? Maybe TA make something similar. Or failing that, what about a custom made inner ring? Any ideas on cost or where I might be able to get one?

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