Anyone know of an out front mount designed to fit Cinelli vintage bars? Actually looking to attach my Bryton GPS. I don't know if there is a mount that provides enough adapters to fit the Cinelli diameter.

Well it probably would have been handy to post the diameter of your handlebars since Cinelli made a bunch (and I believe is how they got started)? But yes any one probably could be made to work with some shimming. Plenty of shim material out there from old tubes or other rubber or actual shims from various crap which my old shop had a drawer full of. Probably not a lot of modern mounts that will fit your specific set up assuming not 31.8 out of the box though.

Yes, my bars are Cinelli 66 with a XA stem, 26.4. I had a Chinese Bryton mount but the white metal snapped in the arm right at the bar.

Just wrap with 3/4 black vinyl electrical tape.

I’m thinking the mount that just snapped on me at the bars (always use a lanyard with your GPS), snapped because of how the clamp worked with the built up bar diameter, so it would be great if the manufacturers provided a suitable adapter for vintage bars.