This oil filter has a perforated metal exterior with a paper filter element and comes with seals and a spring making it a one-and-dome deal unlike other filters out there. This filter also has a special built-in relief valve system and provides up to 40% more effective filtration than the original OEM filter. This filter system is a better substitute that the drop-in fiber oil filter. Fits 1953-(Early)1982 Harley Big Twin Models & 1954-1978 Sportster/K Models Replaces HD# 63839-53