Cotton tape is about it for a 60's bike but a possible alternative is to find a bar/stem/brake levers set with the "Pleather" bar wrap sleeve Motobecane introduced in 1978. This is what I did a few decades ago when I built up my 1st Grand Jubile from a bare frame. Their Catalog says "easy to replace", but the set I traded for already had its hood portion amputated (by someone who didn't agree) to allow for some Shimano 600 replacement levers with standard rubber hoods. My set has a French 22.0 Balleri stem, but somewhere in late 70's-early 80's Motoecane began phasing in non-French components too. These were produced in large #s and I still see bar sets at swap meets & on eBay so you might find one that fits a standard headset. Don

poor scan of 1978 Catalog

from eBay ad

Mid 70's Grand Jubile