Of all the components that make up this Taillight(s) the Nut,flanged,6mm has the lowest price.
A sample from the products for the Taillight(s) include: Screw,tapping, Bolt,tapping,5x16, Bulb,12v 5w, Washer,6.5x20x1.6.
The most expensive part in this assembly is the Lamp-tail.