Replace your boring wingnut with this vintage crystal prism ball that has been tapped to 1/4-20 threads to match a standard air filter threaded post. The glass prism is 1 1/2" in diameter and the overall height is 1.95 inches, so you'll need at least 2 inches of clearance under your hood — if you even have a hood on your ride. This was originally sold and used to hold lampshades in place.
