Sunlite Sunlite Braze-on adapter Braze-on Clamp Adapter 31.8mm Silver – The Bike Hub
Front Derailleur Clamp Adapter 28.6mm 29.6mm 31.8mm 34.9mm Braze On Degree For Java Minivelo Road Bike Folding Bike 2 Speed - Bicycle Derailleur - AliExpress
Shimano Dura Ace Adapter Clamp For Braze-On Front Derailleurs TotalCycling.com
Brand New Durable 34.9mm Front Derailleur Braze-on Adapter Clamp | eBay
NOS Shimano Downtube Shifter Braze On Adapter Clamp: 28.6mm - 600 Arabesque SL-6200 - Bike Recyclery
Venzo Bike Bicycle Adjustable Braze-on Front Derailleur Adapter Clamp 31.8mm - Walmart.com