Had a quick look this morning and there seem to be 6 still flying with the pannier. 258063,258072, 258180,258210, NA0431, NA0410. Serial No 258180 is the old RMC one.
258063 is up for sale and pictures can e found on the www showing the pannier.
They were so rare I don't have any details of CofG, Flight Manuals etc squirrelled away.
M.E.