Couldn't you just build up the lever with tape and press fit them on? Not exactly sure what this particular item looks like but that may work if just for temporary use.
I did not know that you had them. I was operating under the false impression that they were going to be NLA, so I had better be sparing in my use of the NOS ones I already had. Good to know!Like the others have said for a temporary replacement just put a dab of silicone in or something.
Or if you got the knobs at a good price put them on as I have new ones readily available as well as the control cables.