I would suggest looking for good originals where possible, they carry part numbers, they fit, and with a little elbow grease most of them can be made to look as good as new.
I agree 120%!
For the most the quality of the used parts coming from the desert states are much better than most of the reproduction parts. When I fist started working on my truck I was buying all this shiny new stuff until I discovered that the old stuff costs less and fits better.
It may not look as pretty but that's why God created sandblasters.