I too assumed the MP rods were just dolled-up originals, but NO, they are new forgings of better material (4340 I believe, possibly 5140) and bear the word "Mopar" on the beam as well as their "P" prefix part number. Same with the BB MP rods, they had a standard and "6-Pk." rod available at the same time as the SB rods (340 size, too) made of the better material with good bolts and with the "Mopar" logo forged in and a "P" prefix part number(s). The 6-Pk ones are dreadfully heavy, but look indestructable.