Oil Filter Cooler Sandwich Adapter Plate Aluminum Kit AN-10 & AN8. Center Adapter: M20 x 1.5 and 3/4 x 16 UNF Thread; Supports Oil Filters That Has M20 Thread and M20 Block Fitting. Universal - M20 x 1.5 and 3/4-16 UNF Threading Engine Blocks and Oil Filters Only.