I replaced my American jazz and MIM jazz with EMG pickups...SO, I have two sets of Fender Jazz pickups that sort of look identical....I want to make sure that I'm replacing the correct pickups in the correct bass...could someone briefly describe the underneath of a MIM jazz pickup...One pair has a reddish color around the sides of the magnet and the other pair does not....the pair that doesn't also has a 6 digit number on the bottom...any help would be greatly appreciated...thanks!