New Old Stock Tillitson Carb Fuel Filter Cover, part number 1399-1135. Listed as used on the following engines Mark 20H and 55H with KA7A carbs, Mark 25, 55, 55A, 58, 585A, 75, 75A, 75HA, 78, 78A, Merc 35A, 300, 350. Could be others, Priced at $12.50 plus shipping in a small flat rate USPS box.