1952 (?) Cadillac 331

Oil Bath Air Cleaner (Inner Piece Only)

Cadillac oil bath air cleaner inner piece only (this is not an entire air cleaner - it is just the insert that fits inside of the air cleaner, as shown in the photos). I acquired this in the trunk of a '52 Fleetwood parts car, but the previous owner had a number of Cadillacs in the '51-'55 year range, so I am not sure whether this is an insert for the '52 and up 'batwing' style air cleaner, or the '51 and earlier round version. Please ID it from the photos.

Good original condition with a fair amount of surface rust, but no rust holes or significant dents.