5/16" (8mm) Hole Size Stem Length: 21mm Flange Size: 20 mm Black Nylon Screw Type Retainers Compare with: Auveco #19140, Acura # 90505-SLO-003, 90505SLO003, Car Pak # 97-7704, 977704, Barnes / Kar # CP977704, CP97-7704, Disco # 2163PK, 2163B, Kent / Lawson # KT11366, Winzer # 501.2407, Wurth # 150159563, Kimball / Midwest # 13055