Probably a stupid question but...
I have an ESP M-100FM I was going to upgrade the pickups in and was wondering if all guitars with tremolos need trembucker spacing, no exceptions?
The stock pickups don't say F or T or anything in the name to indicate trem spacing but I assumed all guitars with tremolo had wider spacing.
Might consider measuring the spacing between high and low E at your bridge and check the specs of the pups you're considering.
One note: if you decide to go with Trembucker (Seymour Duncan) with cover, it won't fit in your existing pup rings. it's wide by about .5 mm and you'll have to sand the ends of your pup ring.