I have a rear wheel from an 800i model (same as 620's) in excellent condition, in O/E grey. No disc, but otherwise complete and ready to fit. Bearings and cush drive rubbers etc. are perfect.
These lighter rear wheels can also be fitted to B class models I am told (I think you just need the correct axle).
I can email pictures.
Asking £75.
PM me if interested.
Ian
#100