Parts such as the Fuel Tank - Seat: Nut,flange,6mm, Cap,fuel Filler, Body,fuel Cock, Cock Assy.,fuel are included in the Mb50 Mb5 1979 (z) Japanese Home Market Fuel Tank - Seat parts fiche.
With a quantity of two pieces, the Collar,tank Rr.mt is the most used part in the FUEL TANK - SEAT diagram.