I have now a possibility to buy old genuine 1962 vintage Fender Jazz Bass pickups, no reissue, from Ebay.The seller seems to be solid, with a lot of posssitive feedback. I am worry about getting some more hum from that pickups after replacement, due to be NOT reverse wounded (?). Now I have new Fenders Original Jazz Bass aftermarket pickups - reissue - in my 1968 old Jazz Bass, which are O.K., but I think could be better. I don´t wanna make a mistake! Can anybody advise?