When I bought my GS, it had had the K100 front callipers fitted.

Yup, that's an option too.  Or should it be option 2 …  😀The way things stand, I'm not going to be ordering the fancy CNC machined part that I would have liked, as the numbers don't stack up at this stage.I'll make some further enquiries about the K bike callipers, and I've also read that callipers off some of the later R bikes fit with a little work.Cheers for nowJohn