Originally Posted by bulgie

Thanks, good to have.

I notice they don't give you what is arguably the only measurement we need, the inside width, which should match up with the outside width of the braze-ons on the frame.
We can infer it from the measurements they do give though, looks to be 58.5 mm. Is that anywhere near the BO width on your frame?

The BO width can be narrower if you don't mind a stack of washers to make up the difference. But beyond just a few washers, that's ugly and structurally inefficient. The frame can't be wider than 58.5 mm though, not without unbending and re-bending the adapter.

Probably easier to just make one, out of suitable steel, just two bends and 4 holes. Stainless is harder to work with, but has the advantage of not rusting, so that's probably what I would make it out of. I'm happy to provide more tips like where to buy stainless, how to drill it etc, ask if interested.