Hi .
I have a couple of dx fd-m650 endless band mechs with 34.9mm clamps.
Tried to add link, but it may not work 🤔
https://www.retrobike.co.uk/threads/shimano-dx-fd-m650-endless-band-front-derailleurs-ideal-for-alpinestars-al-mega-cro-mega-frames.492789/