Heavy Hitter: The Black Series clear lens is the big news! Compatible with 90% of Japanese vehicles with stock halogen or xenon projectors, it is hugely universal.
Black Series: Named after the projectors they fit. If yours have a black plastic lens frame similar to the one shown in the product pictures; the Black Series lens is the way to go for a snap-in upgrade that will vastly improve your light output!
Jap-Spec: It is very common for many modern Toyota, Lexus, Scion, Subaru, Nissan, and Mazda vehicles with 2.5" factory projectors to come with the projector that's compatible with this Morimoto clear lens. If you're unsure, feel free to ask! (H7, H11, D2S, and D4S are all common bulb sizes in these projectors)
No Brainer: Adding a set of clear lenses to your OEM headlights or projector retrofit with OEM projectors should be a "no-brainer". Not only are they an inexpensive upgrade, but the Black Series lens allow the projectors to perform to their maximum potential in every aspect.
Size Matters: When picking out a pair of clear lenses, it's not about which model is "best" - it's about compatibility. The diameter AND focus height of the Morimoto clear lens are both very important.