1985 Mack R Model RM6866 RS. 1985 Mack R Model RM6866 RS with EN6 RS SM6866 diesel engine and 5 speed manual gearbox. Also has Airbag suspension. WRECKING NOW! Please note, some popular parts may have already been sold, so please advise which parts you require and we will reply with Price and Availability. We are located in Far North Queensland, but we ship Australia wide daily.