Hiflofiltro HF171C Chrome Premium Oil Filter Replaces OEM part numbers - Harley : 63731-99A Hiflofiltro oil filters provide the highest quality in filtering with a longer life than comparable OEM filters, test results prove 28 percent longer service life than O.E. brands Constructed of the finest materials available from well known manufacturers: Steel from Toyota Tsusho and NKK Japan, glue from Henkel Germany, filter paper from Ahlstrom Filtration Finland, Hollingsworth and Vose USA and Awa Paper Japan Every oil filter goes through 16 individual quality control checks before it is ready to leave the factory and the whole manufacturing process, is regularly audited and verified independently by TUV SUD With the experience of more than four decades, continuous research and development and modern production facilities, Hiflofiltro manufactures some of the best quality oil filters in the world