Originally Posted by
Vintage_Cyclist
DMR hinged clamps. Solid and don't have shift-around tendencies like some of the other bolt-ons do.
Velo Orange sells them, but is currently out of stock. Some of the UK vendors also sell then.
I use them on my International, they work great and don’t interfere with the cables.
Pro tip: The bolts that attach the cage to the clamp are a couple of threads too long and run all the way to the bottom, they could scratch the paint underneath. File them down, use slightly shorter bolts, or add a washer like I did.