Do the bridge Juggernaut 7 pickups work for an Ibanez RGA 7320?
and would my guitar work if I just replaced the bridge pick ups with the juggernaut pickups?
The RG7320 you mean? Yes Juggernauts, like any BKPs, will install in those. Whether those are the best choice for that guitar depends on what style of music you play, tuning, amp ,etc.