"Trim Grade/Class" VIN decoding?

Ah, that would explain it. Thanks!
So is price class based of off MSRP pretty much?

The interior trim code influences MSRP not the other way around. I had a pair of 66 Dart 2-door hardtops. One was a 270 (LH), the other was a GT (LP), The plain 66 Dart would have been an LL. The Dart upholstery could have been feature-less all vinyl or cloth and vinyl, and it had rubber mats on the floor and no rear arm rests on the 2-door models. Carpet and rear arm rests could be ordered. The bases on all Dart models was plastic that matched the rest of the interior. Even so, it still would be an LL model. My 270 was all vinyl with an intricate tuck and roll that were a part of seat insert. 2 different vinyl textures were used on the seats. The floors were fully carpeted and every door had an arm rest pad mounted on a chrome plastic base. The GT models came with thin shell bucket seats that were single colored and stitched in a square bisquit pattern. The GT had carpeting on the floor as well as on the bottom of the door panels and on the backs of the bucket seats.

My Demon is an LL model. It has feature-lessº 1148621-72e810cabfe1d7b613e1ab690ee76d29.jpg
cloth and vinyl upholstery bench seats, no rear bench arm rests, and the car had rubber flooring. Some one with more experience will have to pipe up if the Demon all-vinyl interior decor option pushed the car into the LH class or if specifying buckets and a console brought along an LP designation as well as "walnut" trim in the door panels (also found in the decor option).

Note: º feature-less. See photo above. Note the absence of any thing that would add texture to the seat other than the material itself . This is the cloth and vinyl back seat from my LL Demon. The cloth is OEM material, the vinyl comes from a more recent manufactured source.

72 back seat small.JPG