When should rusted body parts get the heave ho?

I would save them but Im guilty of saving too many parts. Seems like I usually throw something away and then realize I could have used it for something when its too late. If you dont have room to store parts then maybe try to give them away rather then scrap them.

You are located in Canada? Id bet they see a lot worse looking parts there. I know the 66 dart parts car I bought recently has no trunk lip at all.