imperials are a5 bridge, a2 neck as far as i know. jimmy used to use a pair of 59's for years in his strats and i cant really tell much of a difference having seen him with both. jimmy plays this type of guitar with both pups on almost all the time but honestly i dont know know how much it matters. ive seem him with a tele, a sss strat, a few different prs models and some other things and he pretty much sounds the same. ive tried the imperials and they werent my thing, not bad but they didnt do anything that made me want to put them in any of my guitars