They're an odd size, so basically only those with them fitted. However p94 pickups are humbucker sized.
Agreed with the others. The only guitars that you can fit P-90s on are guitars that originally came with them.
Guitars: Custom Lado Earth 2000-3, Custom ESP Explorer, BC Rich KKV, Gibson LP Studio, Greco SG, El Degas Stratocaster, Agile AL-3000, LTD EX-351

Rig:Marshall JVM410H + Marshall 1960A, Boss Noise Suppressor
does that mean that PRS soapbar guitars do not fit seymour duncan SP90's? dernit
Someone could make a killing making and selling pickup rings that allowed you to use P90s, mini-humbuckers and single coils in humbucker slots.
Posers are like punks, except they do it for fashion