Bungy, when you say right or left, is that looking from behind the bike or from in front of the bike? The reason I ask is that I'm fairly certain the CB antenna is on the right side, looking from behind the bike. No need to change anything if you want your AM-FM antenna on the left, looking from behind the bike. If you don't want the CB antenna installed, just remove it.
Anyway, if I'm wrong (wouldn't be the first time), you can't just change the cable connections at the radio. The CB antenna cable has a load coil assembly, the AM-FM does not. You would need to change the cables from side to side at the T-Pack, I'm not sure if there is enough cable to do so but short extension cables should be available at a good audio shop.
Jerry