Tail light bulb holder, excellent quality you can actually see and feel. Unlike some of the units made in China, this unit weighs more due to the construction as well as the chrome plating which increases the reflectiion much greater so that your tail lights can be seen. Pair this unit with a Hella reproduction lens and you have the perfect combination for your bus with dual bulb tail light set up as they came stock Europe. Fits 1962-1971 Buses with European style taillights, dual bulb, fits left and right, each.