Just replaced my original '68 non RS grill with a new one (the old one was getting warped & brittle). Old center grill section still had the original lower clips on it. On mine, the center grill to valance panel uses clips and sheet metal screws. Can't guarantee it came from the factory this way as I'm not the original owner, but think this is the first time the old grill has been out if the car. The center grill to lower grill (flat black aluminum strip is secured with nuts).