Great info, but can we find the small antenna under the starboard wing or did these guys fly without IFF for a while?
I have paid my attention to the IFF underwing antenna. None of the Spits with he starboard underwing seen had the antenna type there. So it is very lkely they didn't have the device installed yet. Here one more shot of the SH-Z. The insulator can be noticed while the wire not. Also no IFF antena on the starboard underwing.
the source: the net.