Predator choice?

Hi guys, for my conversion i have a 2007 5.7 from a Charger, but I have a flashed I believe 2005 RAM computer, which PREDATOR do I buy? I emailed predator but they never got back to me ](*,)

U7135 for charger
u7137 for ram

somewhere it said that you can't use one on the other said vehicle.

anyone steer me in the right direction??

dave