Having sold my F850GS, I have a few items pertaining to it and the 750 variant.
Euro box eliminator pipe by Dominator. £40
Connector pipe in 51mm stainless to fit either the above or any standard 51mm clamp on exhaust can. £25.
Stainless steel Fuel exhaust oval can with carbon end fitting, clamp, hanger and DB killer to suit the above. £60.
SW Motech quick release pannier mounting rails to accept Givi monokey cases. £100.
A pair of black Givi monokey Trekker 33 litre cases to suit the above. £180.
Location is Gisburn on the Lancashire / Yorkshire border.