Is it possible you could make some? I made some similar for my Gutzzi ages ago (doesn't usually use them) to rectify a similar problem. There was discussion fairly recently someone also had I think a similar with an earlier wheel- I think the early A65 had a part that rectified it
I guess you need something to work from...I have a '69 wheel I can pull them out of and take pics and measure if that's any help ? Maybe tomorrow arvo or next day??