K&N makes covers for their filters. Maybe one of them would fit your choice for the "rainy season"?
Snowmobile Air Filters and Filter Wraps by Size
Mounting Flange Inside Diameter Filter Base Filter Top Filter Length Flange Angle Part # Snow Charger Part #
2-7/16" 3-3/4" 3" 6" 20° SN-2510 SN-2510PK
2-7/16" 3-3/4" 3" 5" 20° SN-2520 SN-2520PK
2-7/16" 3-3/4" 3" 4" 20° SN-2530 SN-2530PK
2-7/16" 3-1/4" x 4" 3-1/4" x 2-1/2" 5" 20° SN-2540 SN-2540PK
2-7/16" 3-1/4" x 4" 3-1/4" x 2-1/2" 6" 20° SN-2550 SN-2550PK
2-7/16" 3-1/4" x 4" 3-1/4" x 2-1/2" 7" 20° SN-2560
2-7/16" 3-1/2" 2" 5" 0° SN-2570 SN-2570PK
2-3/4" 4-1/2" 3" 4" 0° SN-2580 SN-2580PK
2-3/4" 4" 3" 5" 10° SN-2590 SN-2590PK
2-3/4" 4" 3" 6" 10° SN-2600
2-3/4" 4" 3" 6" 20° SN-2620 SN-2620PK
Mikuni VM36-38 carburetors use filters with a 2-7/16" I.D. flange.
Mikuni VM30-34 carburetors use filters with a 2-1/4" I.D. flange.
Mikuni VM40-44 carburetors use filters with a 2-3/4" I.D. flange.
K&N Snowmobile Air Filters & Accessories
Just trying to help, guys....