According to ETKA, the AAZ was only used in A3 Golfs and Jettas (the entire run, 1993 to 1999), late B3 Passats (starting in 1992) and B4 Passats (the entire run, 1995 to 1997) and it would look to be primarily Canadian market cars. We never got any of these here in the US.
Given the part number of the pump is specific to 1992-1993 B3 Passats, that pretty much narrows down what it came from, at least if the pump and block are original to one another. Another clue would be the 02A it is bolted to, as that would also be B3/B4 Passat (the AAZs in Golfs and Jettas got bolted to the 020 transmission).
None of these were equipped with an intercooler. However, all A2, A3, B3, and B4 cars share the "tripod" engine mounting arrangement, with three large chunky (some liquid filled) mounts holding the powertrain to the front and rear subframes, the one on the front located under a bracket near the starter mounting boss. The picture clearly shows the little "nub" mount that A1 cars used, which used two mounts at each "end" of the powertrain (one by the belt, one at the end of the trans) and two opposing roll stop mounts (one at the rear of the transaxle under the steering rack area) and the front one shown that fits into a socket bolted to the front of the body (the A1 has no separate subframes).
So my *guess* is, someone took a powertrain from a Canadian market B3 Passat, switched the mounts to fit an A1 chassis, and stuffed it in a Rabbit or Scirocco and modded it with an intercooler and some sort of change to the pump's fuel enrichment boost mechanism.
Do you have any other pics of the other mounts?