Depends on the route, some have raised sections at the corners for the mini trim ring, some do not.
A screw driver and 3 minutes would determine what you have.
the universal plate is fine and dandy but would require machine screws for the p90. most p90’s come with wood screws and direct to the...
some days I plug in and my blues driver sounds like crap....
then I realize it's just me, and it goes back on the board....
I still haven't tried the Boss OD, they seem to pop up under $35 on CL once in a while, the BD is never under $80
My favorite P-90 pickups are are the Fleor.... I dare you to search for them..... be shocked by the price.... not even sure if they are still made.. the ones available and that I have received look to be old stock by the packaging.
Yikes! I just looked up how much a set of those pickups are!
they should fit at that price.
are the base plates in the way or just the plastic corners?
I’d maybe heat or file the corners.
I have the 18 special too, and while the minis read hot, I didn’t find them particularly offensive…...