We recommend to replace the seals of the oil filter housing with each disassembly / assembly. We replace the seals each time one of our oil cooler kits . Included in the kit: 3x double seal 1x O-ring seal Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com