Early vs late 71 bucket seat ?

[EL5DEMON340]

Couple ?'s on bucket seats for 71 demon, i have a late 4/02/71 demon 340 bucket seat car, and i'm looking for a set mine were missing when i got the car :angry7:
1 * Should the seat have the long rectangle button or smaller one?
2 * should the track have the (L)? brackets, my mounting holes are
12.5" front to back & 12.5" side to side, so its square.
3 * i see seats that look correct but don't have the (L) bracket, were these
removable from the track itself ? are these repoped?
4 * NE1 have a few good pics of the bottom and sides of the late seats?
5 * NE1 have a good set for sale or trade? sorry had to ask:cheers:

 

[Demon416]

Here's the photos I promised you. Didn't get a shot of the front of seat back, but don't think the Duster had the bottons. I'll check.

http://www.forabodiesonly.com/mopar/showthread.php?t=57156

 

[Demon416]

Here's a picture of the '71 Duster bucket.

https://www.legendaryautointeriors....catalog.aspx?id=AA&make=C&year=71&desc=duster

The '72 Demon had the rectangular buttons, not the Duster.

 

[6pk2goDemon]

Here's a pic I took of a seat side w/ a date code of 3/71. You can see how the seat release button is integrated into the seat.

Interesting, because the attached tracks were the early type w/ the cables between them to adjust...hmmm. :scratch: