I just picked up a pair of these to mount LED lights on one of my bikes. Very nice quality and works for 7/8", 1", and 1-1/4" tubing by removing the rubber inserts. These are very nice chrome and priced right! Buy in bulk and save! These are NOS parts. Very solid!
https://www.OldMiniBikes.com/chrome-clamp-with-rubber-inserts.html
https://www.OldMiniBikes.com/chrome-clamp-with-rubber-inserts.html