Without knowing my build date on my old (long gone) 1972 base Firebird, I don't know if this is any help.
My Firebird had the Amber lens/plastic housing, and the plastic valance.
Since it was my first car, and I grew up in the Hot Rod crase of Southern California, cruising Van Nuys Blvd. and Whittier Blvd. and others, I took my parking lens off, cut off the amber lens, and glued on blue plastic, and put them back on the car.
lasted only one day, before I found out they were illegal.
Went to the junk yard, and had to get replacements.
Oh, to be young again (and stupid).
George
