1969 era brackets

[Jack Innes]

I am once again going to exhibit further my ignorance of later post war vehicles as follows;

In the manual on my 1969 truck there is mention of a 2 rifle brackets, 2 machine gun brackets and a bracket for a rocket launcher. I have one machine gun bracket & the lower rifle pieces. From pictures the upper spring clips are similar to WWII pieces but have no "tail" & 2 holes to directly bolt them on - is this a common piece? What would the Canadian military carry as a "rocket launcher" in 1969? It cannot be too large since it mounts behind the passenger seats.

Is there an easy source for any of these brackets?

What would a vehicle first aid kit look like in 1969 as well?

Is there a theory I am unaware of in that the vehicle has permanent seating in the cab for 3 people but capacity to stow 2 rifles & 2 machine guns?

Thank you,
Jack