Were '66 headrest seats available without recline?
 

A decent set popped up recently, but before I send and $$$ need to know... thanks!

Yes, Code 571 @ $41 for bench seats and $52 for Bucket seats.
They were included in the reclining seat option.

yes
I have had both 66 with and without over the years

Many thanks, I will keep this in mind!

Repro headrests are available in black. Around $300
w/hardware. Easily added, nothing special about the
seat frames themselves. Just don't pay an exorbitant
premium is all I'm saying.

I installed the repro headrests in my '67 quite a while ago. As I recall, they were reasonably priced at the time. I painted them to match the seats (blue) and they look great, and I see no wear after more than 10 years. Not sure about the '66, but on mine the mounting hardware was inside the seats. There are several detailed posts describing installation.

1966 and ‘67 are the same including the hardware that is under the bucket seat back.