Stay away from the repro stuff...if you go that route you will live to regret it!!
Best bet is to use original assembly line pieces...fix rust or damage as needed...I emphasize 'assembly line pieces'...some of the later NOS stuff may not work as well as the originals.
The assembly line parts are the only way to go...things will line up...molding will fit properly...etc.
If you do a quality repair to the originals there won't be any problems.
-wilma