Depends on the year, in 1998, normal double locking trem is used but in 2002, Ibanez uses their own ILT1.

To swap this trem, you should be fine purchasing either an OFR/Schaller LFR/Gotoh LFR/other LFR that's direct patent from the OFR. One note though, if you're swapping it with an OFR, you'd probably need to shim the saddles for the OFR to be working properly with Ibanez neck.
"Play with your ears" - Yngwie Malmsteen, Paul Gilbert
Thats what she said...
i have an rg270dx too and i'm replacing the bridge/tremolo also. the bridge currently on it is a licensed floyd. i'm just wondering if an original floyd rose would fit.