if you are talking about the front corner amber side marker lenses,then they come off with a screw inside the engine compartment then some generous tugging and they should pop out(the bottom has a pin type mount that pushes into a rubber grommet so it may take a little effort to get them out......)
NO no I need to take just the amber lens off. It is broken. I have the whole housing assembly out of the truck and got so far as taking the chrome trim piece off but can't take the lens off. I can't see what is holding it on.
I just looked at the cracked one I took off my wife's 80, looks glued together. Want me to bust it open to make sure? It'll have to be tomorrow eve earliest. No point unless you have a new lense. I need the bulb connector that's on the harness, one of the copper contacts corroded away on this connector from all the water and salt getting in. I guess that's why I got the truck cheap.