It is convex. Didn’t have any trouble. It’s 16.75” long, but the brackets sit at probably 13” (didn’t measure them,just a guess). It came with self tappers, and the notched area in the headliner was just right for placement. Amazon advertised it as a golf cart mirror. It has thumb wheels for easy adjustment, and vibration is minimal. If anyone is interested I can post the model number. It really works well. I tried a stick on convex first, it was small but worked until the glue on the back gave out.