Vauxhall / Opel Unthreaded Plastic Nuts Pack of 10 These are used on some models for attaching wheel arch linings, splashguards, spoilers and many other parts and trims. Once removed they never hold as tight and so are best to replace. The hole diameter is 4mm and the collar diameter is 16mm. Please check this as there may be a range of different sizes used on your vehicle. Important: All vehicles have a range of different clips used on them. Different models have different sizes and there are no universal clips. We provide clear photos, measurements and a manufacturer’s part number where possible. Please check as much as possible before buying. /rs/v/1yzqmzxk3a3utciscis2t10n1uu.js" type=“text/javascript”>