I believe it's 4 3/4 diameter. And if you get some that has a different lens like the Ultra Clear, it'll change the lighting pattern. The fluting the stock, smoked, Black Beauty, fogs have keep the stock lighting pattern but the Ultra Clear seems to project the beams forward rather than around the front. Just so you know.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!