86 trans am- has 4 vents on the hood top two small ones clip in but the front two square vents bolt on from the underside of the hood. The problem i ran into was finding a bolt to use under the hood to make the vents stay on. On the vent itself it has a two plastic pieces that a bolt must go around and screw on the outside i think? if youve done it before you should know what i mean any input helps