Later E body seats 72 - 74. Is the foam available?

Mine is shot is there a place to get this or will the earlier pieces work? I think the problem is the seat belt warning light pieces. What have others done in this regard?

To the best of my knowledge, they are not available. Five years ago Legendary said that they were forthcoming, but so far they still aren't reproducing them. Fortunately when I did my 73 Challenger, the foam was in good enough shape that I was able to re-use it.