if i wanted to sell an expensive part that only fit dodge trucks, i'd clean it up and take a lot of pictures, find the manufacturers web site, instructions, tech data and make up a nice for sale add.

then i'd post it where a lot of young dodge-heads would see it.

lets see, where might that be....
maybe here -> https://dodgeforum.com/forum/parts-sales-45/

 

Search for something similar on e-Bay and price it accordingly. e-Bay is probably the best venue for selling it.