Help IDing Shelby brake ducting and tail lights?

Hi, my uncle found these parts in his garage and gave them to me. There were some parts for a rear brake cooling kit and some tail light lenses. They were purchased by another uncle who passed away shortly after, and have sat in storage for almost 40 years. They appear to be unused. The backing plates had red tags attached to them with part #s, reading:

S1MR-2211-A
Backing Plate
Mustang
Vented R.H.

and

S1MR-2212-A
Backing Plate
Mustang
Vented L.H.

Searching the part #s in google, it shows up as a backing plate for a Shelby GT350R. Is this accurate? link: http://www.shelbyparts.com/parts/350r.html

Also included was the fiberglass ducting for the backing plate and the flexible tube. He said he also had the exterior body scoops, but couldn't find them at the time.

The other item he gave me were some taillights, but I've never seen anything like them for a Mustang. Anyone have any idea what these are for and where they came from?



And some pictures of the brake hardware:








The fiberglass brake stuff has no part # on it, are these shelby parts? Is there any way to ID them?
Thanks!
Ben Sinclair