I am quite sure item 31 is the ‘L’ shaped part you are referring to. I am in the UK for a few weeks and should be back home in South Africa in September.
If you have not received your answers by then, I’ll have a look at my soft top and we will continue from there.
However, believe me, there are more experienced chaps on this forum than myself and I am convinced you will have all the answers by then.
Hang in there.
Chris