I have seen two variations of the 2863215 7 blade engine cooling fan. One version has the part number ink stamped on one of the blades and the other version has the part number stamped into the metal at the end of one of the blades. I am looking to buy a correct one for my 69 Hemi. On ebay one of the sellers states that he believes that the ink stamped version is correct for pre 70 and the metal stamped version is correct for 70 and later. Does anybody know for certain if this is true?...Thanks