The PATB Stack is a super tall pickup. I've had them in Ibanez' in the past and had to route the pickup cavity deeper. The Ibanez routes are for Dimarzio stacks, so they're already deep enough for a "normal" stack.
The dimensions of most or all of our pickups are on the website. As a luthier who can route anything into any guitar, I never really cared. I would just get whatever pickup I wanted and put it into whatever guitar I wanted. But I can see why its helpful to check the dimensions first! Very good public service announcement!
BTW the PATB Stack absolutely smokes. It's worth the route job. It's a total sleeper in the line. I mean, we sell them, but if people knew how juicy they sounded, we'd probably sell more.