Help choosing air filter and crank

Where i live now its winter and there are many rainy days so will i have a problem if i use this filter "Stage6 Double Layer Racing Air filter" can you suggest me any other filter (covered preferably ) for my setup ;; I have a gilera runner 50sp 2013​

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My setup​

Stage 6 racing mkII cylinder
Stage 6 R/T VHST 24mm Carb
r-setup 14k exhaust
Stage 6 intake system​

Stage 6 R/T MKII crankshaft (Also what do you thing will be better for my setup an 80mm conrod or an 85 one)


I havent ordered anything yet waiting for suggestions...​

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Thanks for reading and sorry for my english :/​

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use the standard airbox, ive just had similar problems with my scoot (i live in norway) and i ended up puttting my standard airbox on (i had to mod the airbox so that the air into the box was the same as the air through the carb (ei, the airbox had 10mm opening and my carb/intake is 21mm)