I bought this 21351PD Snapper Hi Vac, and got it running. It looks like a late-80's model, with a B&S 92902-3271 3.5 HP engine. It needed some maintenance and cleaning, but once I got it started, it went. Impressive that it still works and cuts after this many years.
I have the bag chute but no bag; I usually leave my clippings on the lawn, anyway.