Does anyone know any details on the yellow tags that were attached to the seat frames?

I have three removed from 57 BA 2 Door Hardtops years ago.

Two marked:
1037-1037D (clearly 57 2 Dr HT 210 and BA)
2837SD (57 Pontiac Star Cheif)
Guess they shared the "Backs"

Also have one marked only:
2837SD
"Cushion"
Were the backs the same and the cushions differant?

I know we bought a 57 2 Dr HT in the 70s that had a complete 57 Pontiac interior.. .in fact it had 57 Pontiac doors with the trim changed over....