#3
The screws used on those kind of pickups are different than the ones used with rings. The screws on your guitar may not go through the holes on a standard pickup. The ones most companies use are small diameter machine screws. Im going to imagine your uses wood screws which have a vastly different thread pitch. You can always buy some rings and put em on that way. You didnt mention if yours are the P90 style or standard humbuckers.