Dairy connection has larger kadova molds probably have to call unless you have a business account.
Another place to try would be ullmers dairy equipment I know they have 20 lb Wilson style they might have have or can build what you want.
https://www.cstainlessllc.com/cheese-equipmentThis company has what they call a truckle mold which I've heard cheddar round called a truckle before so that might also be a place to check.
For my largest round molds I've cut the rim off a 5 gallon bucket and use it like a traditional alpine mold without the adjustment.
Hope your able to find what your looking for 5 molds 20 lbs a piece that's alot of cheese are you a comercial producer?
(Pictured are my bucket mold alpine style cheese)