The Ostwind was a single mount 37mm Flak 43 mounted in a large, open-topped turret on a Panzer chassis. One version had a twin-mount Flak 43.
The Wirblewind was a Quad mount 20mm Flak 38 mounted in a large, open-topped turret on a Panzer 4 chassis.
Given that Prigozhin has openly said was is unspeakable in Russia proper, one wonders if Putin will finally attempt to silence him. I wonder if there are enough forces that are not entangled in Ukraine that can stop Prigozhin from making serious trouble in Russia.
Personally, I think they are going to aim for Crimea. Or at least threaten it so Russia rushes to keep it and use the opportunity to destroy the Russians as they attempt to do so.