Someone cut them off to connect a different sidecar.
If you have a damaged frame you have been keeping because you are like me and think it may be of use some day, we could make a deal.
check out this website. They would have the "balls" ready to weld-on
https://steib-bornowski.de/cart2/index. ... 1_21_57_60
hope, this helps
Thank you for the photo. I will put it in my R51 file.
My poor wording, one ball attachment and one bolt attachment.
I will give you a call soon and you can give me a few insights, before I go charging into this venture.