Hm, I feel like cylindrical HEPA filters are common for shop vacs and widely available? Searching "HEPA filter shop vac" on home depot gets what looks like ple

Hm, I feel like cylindrical HEPA filters are common for shop vacs and widely available? Searching "HEPA filter shop vac" on home depot gets what looks like plenty; or are these not what would work for that kind of design, maybe we're talking about different things? They are "cylindrical" by being pleated.