Is this a 242 or 244? In either event I'm assuming that you are talking about the black plastic that surrounds the headlights not the actual mount that holds the bulb in place. If you pop the hood you should be able to see 2 black plastic knobs just over the headlight surrounds if not then you are missing them or some of them. There should be 2 for each surround plus 2 for the grill. IPD sells them or check your local junk yard they are relatively standard up to 85(pre large single rectangular headlight).
Marty