Not in the M2A4 IFV 3-in-1 kit. You want the M2A2 ODS-SA Ukraine kit to backdate into a US M2A2. It has all the parts to do so, minus T157I tracks and sprockets.
See here:
Good catch. Yes, it looks like you may have used the A sprue parts for the rear ramp, which is for the M2A3.
EDIT - You are still OK. This M2A4 still has the port on the door and plate on the ramp.
