Re: TRS, Lo Pro, Edge trem cavities
Nothing but an Edge Pro will swap for an Edge Pro, the intonation point is different from every other tremolo on the market, Ibanez included. YOu also can't put the Edge Pro in a body that wasn't designed for it.
The Edge and Lo-Pro Edge are interchangable with each other.
The TRS rout is different from the Edge/Lo-Pro Edge rout, and you have a 10% chance of an Edge fitting in without having to rout, 90% of the time you'll need to remove some wood. The OFR and OFR-7 should fit the TRS rout though, and are a much better trem than the TRS.