I have a large batch of both used and new R100GS-R100GSPD center stands. The BMW P/N is 46 52 2 316 347 for the new parts. I'll verify what is the P/N (s) for the used versions.
For some time I was modifying paralever center stands to the monolever G/S-ST machines for a more robust design. To me it is easier to mod the monolever center stand for the monolever machines. Yet builders kept sending me paralever center stands...
So, they are for sale. New are $100 plus shipping. Used are $55 plus shipping.
If interested send me an email and not an advrider PM.