P2V-3 Gun Nose:
P2V-3 Gun Nose vs. P2V-7 forward fuselage:
P2V-3C Forward Fuselage versus P2V-7 (the P2V-7 nose looks a bit off):
P2V-7 Nose Turret
The P2V-5 nose turret may be similar but the -5 did not have the raised canopy or the forward nose wheel well.
P2V Tail Turret