Interior Trim?
 

I would like to install a headliner in my truck but don't have any of the interior trim. Does anyone know where I can order new trim pieces? I will go check the pick and pull but I would prefer to buy new trim pieces. Any suggestions are helpful.

Find someone parting one out is going to be a better chance of getting them and cheaper. Most likely you won't find anything at the dealer and if you do it will be expensive.

Are there any websites selling trim, like for restoring first gens?

Look on here in the for sale section or post in the wanted section.