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@walkmanman
Righto, well I remember that one of them converts to the largest ta bcd which is 152bcd. Here's a link to one listed on fleebay: https://www.ebay.co.uk/itm/284129184053?hash=item42276b4935:g:Z50AAOSw4Z1f6NQn
Of course it may just be easier and cheaper to find a 50.4 46t ring but from what I believe the 50.4 size is rarer than 152 ones, but perhaps you know better. I guess the best reason to buy if would be if you'd already have a 152bcd 46t ring.