What to offer for 1977 Ford F100 Parts (PICS)

[KeansClassics]

I am looking to find the value of some parts that are on a 1977 Ford F100 truck in a local parts yard. The truck has been picked over pretty good but there are a few things still there that I would like to grab before they scrap it. It has a good front bumper I could use, what is a good price on that? The back glass is good, what should I offer for that? It has a nice straight hood, and he said $75 on that or make an offer. What do you think is a fair price? The grills and grill shell is in pretty good shape, what is a good price for that? The interior head liner is good, what is that worth? And finally the two front splash aprons, I think that's what they are call, what are they worth? These seem to be rust free, and they usually aren't. If anyone could offer some advice on these parts, please do! Thanks!