Milwaukee Twins 39mm Fork Seals For Harley Dyna / Sportster / FXR The Milwaukee Twins 39mm Fork Seals ensure optimal suspension performance by keeping fork oil contained within models equipped with 39mm Showa forks. These high-quality seals are sold in pairs, effectively preventing leaks and maintaining the integrity of the suspension system. Formerly offered under the J&P Cycles brand. Features: Fork seals for models equipped with 39mm Showa forks Sold in pairs Replaces OEM 45378-87