I haven’t, however, unless there is an error in the description, how do they expect a 25.5 mm will fit over a 34 mm tube - the dust- covers, I have ever used, are not that giving, although they need to sit tight and be flexible almost 10mm on the circle seems excessive. I would email and ask.
You can buy them from partzilla
https://www.partzilla.com/catalog/yamaha/motorcycle/1975/xs650b/front-fork-tx650a-xs650b