Plastic trim locking nuts are trim clips which are automotive fasteners manufactured in nylon which are an original manufacturer replacment suitable for Volkswagen, GM and general automotive use. Tail Light NutDimensions : Head 12.9mm x Length 7.8mm x Hole Size 10.0mmReplaces Volkswagen OE No. 179813881Also replaces GM OE No. 3997391Pack 50 Pces.