Sears Craftsman Shop Vac Filters

It's probably an example of severely outdated technology, but I have a large shop vac. It is for both wet and dry vacuuming. A quick filter adjustment and it switches from one to the other.

I am finding it is hard to find filters for it

Our particular model is the 16 gallon model. It features a 2.5 hp motor. Back in its time, it was great for cleaning sawdust or large volumes of water from a basement.

It's been idle in my humid basement and the current filter has mold, mildew and general decay.

I need a new filter.

Problems

Our Sears store is gone. I saw a solitary filter at Menards, but did not know my dimensions that day.

They seem to be available online, but I feel there should be a filter available locally.