Mares MR12 and also the MR12S poppet seats are all the same from pre 2004 till now. The poppet seat part # is 46186216. The rebuild kit for the MR12 is 46185002 int/din. Remember that the MR12 is the 1st stage only. 2nd stages sold with the MR12 can be the Epos, Axis Rebel Prestige Proton Rover and not limited to those 2nd stages.