5/16" (8mm) Hole Size 13mm Stem Length 8 x 18mm Top Head Size White Nylon With Sealer Moulding Clips Compare With: G.M. # 11611375, Auveco # 21825, Disco # 12808PK, 12808B, Lawson # 1446680, Crest Midwest # CRX29198, Car-Pak # 99-9110, 999110, Winzer # 502.9110, Wurth # 150121825