Just a heads up, if you are using the Gatling 2.0 shroud, TRS says a 90mm will fit. Well I broke two of them trying to get them to sit flush on the lip when I did my first one. Since I just did CCFL in my retros, I used 85mm and came out perfect. Now I'm kinda wishing I would have went with LEDs instead of CCFL as it looks pinkish in person. Doesn't help they are in a smoked lense with true red LEDs in the middle.