5/16” (8mm) Hole Size Flange Diameter: 13mm Stem Length: 18mm Black Nylon Bumper Screw Type Retainers Compare with: Auveco #21172, Ford # W713445-S300, W713445S300, Car Pak # 99-8768, 998768, Disco # 10914PK, 10914B, Crest / Midwest # CRX 20554, Kent / Lawson # P86116, Wurth # 150121172, S&R # 415253, Kimball / Midwest # 13763