I did find the M6 Stud (https://www.mouser.de/ProductDetail/576-908-066, 1,72€ each PLUS 20€ shipping to Germany). I think I will make them myselfNo is the short answer. I could only find a complete 5 stud or 7 stud busbar.
I did buy a spare 5 stud busbar in case of a BB failure when remote. I can also use the BB for spares if I need them. I expect to use some parts during the electrical fit out.