FYI. The small bracket with the rubber mounts looks quite similar to the one on my 1982 Quantum TD. Might be the same.
Unfortunately, the heat shield did not come on the Quantum, so you'd still have to source that (and presumably the rubber hoses?).
For the airbox, I'm told the early Rabbit carbed box is quite similar, but not exactly the same. But, the bracket that holds it to the inner fender is exactly the same (it gets welded on).
Good luck. If you happen to get flooded with emails, let me know. I wouldn't mind having a setup myself.