Welcome aboard. Always good to have another Bradley crewman and builder here.
As to PE, Eduard made three sets for the original M2: Interior, Exterior, and Turret Interior. They also made a smaller set for the M3 Exterior. Unfortunately, I don’t think they are available any longer. You may be able to use most of the pieces from a later M2A2, M2A3, or M3A3 set; at least the basic hull pieces for tools, screens, etc.
Aber does a set with a metal main barrel and coax, and another with metal barrels for the port guns. They are both very nice.
These posts may help too.
https://cs.finescale.com/fsm/modeling_subjects/f/3/t/182687.aspx