NAPA Gold 4770 / WIX 24770 Filter Mounting Base, Pack of 1 Authentic Napa Gold 4770 / WIX 24770 Filter Base Base Thread: 1"-14TPI Inlet/Outlet Thread: 1/2" NTP Overall Size: 3.125"W x 4.0625 L x 1.808" from filter mounting base to top of casting Napa Gold 4770 and WIX 24770 are the same filter base