Evolution: The original Hella "E55" design is the most widely used original equipment projector in the world. So what? It's a good design, but the Morimoto EvoX-R 2.0 is better in every way. So whether it's a new retrofit or a direct swap out for the old; the Morimoto EvoX-R 2.0 is a winner. All-Rounder: Morimoto's EvoX-R 2.0 is derived from the Mitsubishi Lancer Evo X Original Equipment design. It's the best option for upgrading cars that came with older 3" Hella bi-xenon HID projectors and it's also ideally shaped for a traditional retrofit too. 2.0 Performance: Coming standard with a 3" clear lens and a mirror finish reflector bowl, the Morimoto EvoX-R 2.0 manages to produce the MOST INTENSE hot spot of any projector in the Morimoto lineup. If you're looking for the most hardcore down-the-road performer, look no further. Performance like this is not possible with threaded-shaft style projectors! Cross Compatible: Their bolt pattern is identical to older Hella 3" halogen, xenon, and bi-xenon HID projectors - so can be used as a direct bolt on upgrade in many OEM or aftermarket housings that use these designs. The bulb holders are also compatible with D1S, D2S, and D3S bulbs.