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Ah, yeah, even I forget I need the Di2 one. Looks are of no concern to me. It's a leccy gear changer, nothing more nothing less.
https://bike.shimano.com/en-US/product/component/grx-di2/RD-RX817.html
Which one is the 812 one?
There's 11-32 and 11-42 versions but I don't know which is which.