Used door courtesy light lens on the 67 - 70 Cougar. Because of the heat and placement of the bulb behind this lens, they were prone to burning or in some cases melting. This lens is easily replaceable by removing the two screws holding the housing together and grinding off the studs holding the lens and reflector in place. You can secure them back in place with small amount of epoxy.
You can also find the reflector lens here.
Right is same as left, sold individually.