As I understand it, the series 2 LWB army land rovers all had this type fitted. THe series 2 ambulances have them fitted, as did I believe the GS and FFW vehicles.
THe S2 Wrecker at bandiana has that mount for example, as does my S2 ambulance. Ihave a 2nd bonnet with that mount that I believe came off a GS or FFT, interestingly with the hook mounted in a different place to the 2a.