Air Filter for Shin 446S

[Dave from Aussieland]

Hello y'all, I have 2 shindaiwa 446S saws, their getting on now but still going strong. I'm finding it hard to get air filters from them, I can get a mesh box filter but not anything better. I'm wondering if the filters are interchangeable with the shin 452S and/or the shin/echo cs-501sx, in which case I might have a better chance of getting a better after market filter