Saab Unthreaded Plastic Nuts. Once removed they never hold as tight and so are best to replace.
10x Nuts For Saab Plastic Unthreaded 4mm Diameter Hole Bumpers Wheel Arch Lining
10x Plastic Nuts Unthreaded Engine Wheel Arch Cover Undertray Splashguards clips
UNTHREADED PLASTIC NUTS ENGINE COVER UNDERTRAY SPLASH GUARD BODY TRIM NUTS 10pcs
10x Toyota Plastic Rivet Trim Clip- Wheel Arch Lining Fender Liner Splashguard
10x Ford Plastic Trim Clips, Bumper, Splitter and Wheel Arch Lining Clips
VAUXHALL CORSA C FRONT REAR WHEEL ARCH TRIM CLIPS PLASTIC NUTS & METAL SCREWS