It's been a year or 24 since I worked on F3s but from memory they used the two prong jobby.
these slotted into little pouches on the front of the LSJ snd were held fast with poppers.
The single blade type went into a receiver that clipped onto the LSJ chest plate.
I think the Tonka only had the single thicker down pipe from the regulator.
The other type was used on Phantoms, Harriers and mebbe Jags.
For the full experience you should fill one with snot and sweat and let people rummage around in it!