Have a Ural M67/6 1988 given to me by my brother. I am recovering from bowel cancer and needed a project. This lovely bike has been stored for 19 years and has only covered 11.000 k´s. The motor moved freely and I am trying to get a new gear box, My biggest problem is that despite hours of searching on the net and elsewhere I can find no information about the correct handle bar size. The present one allows the throttle grip to simply fall off, any help greatly appreciated, thank you, Jeff.