GlowShift Oil Filter Sandwich Adapter - 13/16-16 Thread Aluminum Oil Adapter Plate With A 13/16 - 16 Includes (3) 1/8th NPT Ports, (2) plugs & (1) O-Ring Recommended for GM 4 Wheel Drive ONLY One Year Limited Warranty & Free Lifetime Technical Support Note: This GlowShift Oil Filter Adapter is only compatible if the gasket diameter of your oil filter is 3 inches or less