Adding Headrests
Save yourself time, aggrevation, and expense....
First of all;
SAVE your original Seats and start with replacements.
If you want the early style Pop up Style Headrests, use a set with the Headrests and Hardware from a '68-'69 A-Body. You can find these with the SplitBench/Armrest although few and far between (mostly in '68-'69 B-Bodys).
And in '71 they had the Split Bench with Armrest BUT High Backs only.
If you want the Later style with High Back Headrests use '70-up A-Body ones.
And that as they say is the short and sweet of it.
Best of luck and call with any questions!
As for the Shoulder Belts I have a set somewhere that bolt in fairly easy.
I will try to find the receipt and let you know where they came from.
Later,
Bruce B.