#1
What brand/model tremolo bar would fit and work in both an Ibanez RG270 and an Ibanez RG220B (if the bar fits in one it'll fit in thew other.
Ibanez RG270
Switch Wild I
Strat Copy

ProCo Rat Vintage RI
Dunlop Crybaby
Ibanez FZ7 Fuzz
Danelectro DJ-6 Phaser
#2
You don't get model tremolo bars...you only get the one that's associated with the model of the trem. In your case you'll need an Ibanez Edge series whammy bar arm, at least unless anyone knows another brand that uses the same design.
...