What condition are they in? If they are usable then most likely they are sellable.
Older car parts fetch more money as they are harder to find, either NOS or at the bone yards.
You can go the Ebay route, or simply find a web board for enthusiasts for the cars those parts fit (use Google maybe). They all almost always have a forum for selling parts.
On the other hand if they are damaged and of no use to no one or you just want to get rid of them then load up the pickup truck and drop them off at one of your local Automobile Recyclers. They take parts usually working or not and dispose of them in a environmentally safe fashion.
Thoughts and comments expressed by me are mine based on my own experience and research and shared here freely. I am not a professional nor make any claim to be as such