Howdy all, super newbie here

couple simple questions, I know enough to create a problem!

06 Silverado 1500 Reg Cab, going to put in an older Apine HU and JBL GTO 6.5'' in the doors.

So far I know I need the PAC C2R-GM24 module. Ebay the best place to get?


Next, is there a factory amp that needs to be by-passed? ( i had to do this in my nissan pathfinder)

Any good recommends for a subbox behind the seats?

Thanks in advance
C