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Continue to ChatAir Filter - 38mm to 40mm, Conical, Waterproof, Straight, Yimatzu Brand, Blue - 60A1360BU - PBC78F1 - https://electricbikeusa.net/express-parts-catalog/air-filters/air-filter-38mm-to-40mm-conical-waterproof-straight-yimatzu-brand-blue-60a1360bu-pbc78f1