I have always loved those swivel front seats. I wonder why they were not put in more ambulances, the Criterion is the only one I know of that did that. When I was a kid my dad had a Monte Carlo with them.
Probably because aside from a few select models in the late 50's/early 60's, swivel buckets had their most widespread use from 73-76, in GM cars like Cutlasses, Lagunas and Monte Carlos, and they stopped making car-based ambulances shortly after that.