Re: Replacing USA Custom tremolo bridge
Unless something is different with the USA Custom line, an Original Edge and Lo-Pro Edge are usually interchangeable. In other words, you can put either one in there, and everything will work just fine... trem stud spacing, routing, etc. But again, I'm not an expert on the USA Custom line. I'm basing that statement on other Ibanez production guitars.
I had a 1989 RG550, which came with an Edge, and 4 years later replaced it with a Lo Pro. The Lo Pro dropped right in (and I personally prefer it over the Original Edge).