They fit into an alignment fixture that allows you to alignt the headlights.
No, they are part of the headlight assembly.
if its on the out side in most cases it is they sell a cleaning kit at the parts store that works good
Your local auto parts store can sell you a kit to restore the plastic lenses of your headlights. Just be patient and follow directions.
hammer
Your local auto parts store should have a kit available to restore the clear plastic lenses over your headlamps.
Check with your local auto parts store, they have kits available that help you restore the faded/cloudy headlight lenses.
There's a product made by Maguire's called Plastix that will remove any scratches on the instrument panel lenses. I use it on my 03 Limited 4runner, including the headlight and tailight lenses. Cheers,
The dealer, EBAY, do a google search..... they are used for roads
Plastic ophthalmic focus lenses accounted for approximately 18.3 percent of the industry's shipments
Fredrick Douglass
Plastic
According to Wikipedia, today's lenses are typically made from plastic, such as polycarbonate. Plastic is used in order to lessen the chance of breakage.