Milwaukee Twins Drop-In Oil Filter With Spring For Harley The Milwaukee Twins Drop-In Oil Filter With Spring modernizes motorcycle maintenance by replacing the traditional stock style felt filter cartridge with a more efficient automotive style pleated paper element. This upgrade not only elevates filtration efficiency but also streamlines the process, making it a smart choice for riders seeking both performance and convenience. Features: Quick change and easy to install upgrade filter Works in 1957-82 models with in tank oil filters