Don't consider 'flocked filters' as a "summer" filter. They're just better filtration, period. The metal screen filters offered by Jonsereds back in the day were a sorry affair. It's only a tribute to the cylinder plating that many of these saws have survived using that metal screen.Pretty much, every saw was offered and issued a winter screen filter, and a summer flocked, fleece, thicker filter. Thats a given. Replacement parts for some old saws are hoarded solely for the value. The rest need not bother.
Kevin