I fit a large diameter bucket that I use for my 6 gallon wine kits. I just have to put a spacer under the front edge of the bucket to tip it back a bit.

A few counter clock wise turns on the screw in the thermostat, and I was getting ice to form when I put a pot of water in the cooler, so 60-64 should not be a problem. I think un-modified it was pulling down to 52 deg F.