Here´s some good reading from the forum:
To retrofit an Edge/LoPro in a TRS/OFR guitar:
The Edge/LoProEdge will not directly swap into your Ibanez (or other guitar) with a TRS/TRS-II/OFR. A few modifications will typically be required
Tremolo Routing Changes - You will need to increase the length of the cavity (in front of the posts and behind the fine tuners), you might have to widen the cavity and you will have to rout the cavity deeper for full pull-up. This is probably more of a headache than it's worth, since the body finish of an already "cheap" guitar will be effected. Due to manufacturing tollerances, it is sometimes possible to "shoehorn" the Edge/LoPro into the Korean ibanez, but this is the exception, not the rule.
Tremolo Posts - All these
locking trems have the same post-to-post measurements. However, the Edge equipped guitars have body anchors that accept the Edge posts which use a set-screw to further stabilize the post to the body anchor. This is a major improvement and something the TRS/OFR guitars lack. It keeps the post from wobbling or moving in the body anchor. The Edge posts do not fit the TRS body anchors. In order to install the improved Edge posts in your TRS
equipped guitar, the TRS body anchors will have to be REMOVED (drilled out typically) and replaced with the Edge anchors (glued into the body) before you can use the Edge post with locking set screw.
Best Choice Option - If you have a TRS/TRS-II equipped Ibanez guitar, you can install the Floyd Rose Original/Pro without any modifications to your guitar. That is the easiest and best alternate.
Useful Forum Topics to Reference
http://www.jemsite.com/phpbb/viewtopic.php?t=4887
http://www.jemsite.com/phpbb/viewtopic.php?t=4918