ECS has some really good reproductions. I bought a door VIN decal for my 1971 ElCamino and complete set of VIN and tire pressure for my 84 z28.
Very happy with them. I saw at MCACN they had some of the inner door decals for 1969 Camaro window warranty stickers. Ones that say the 3 letter code for plant and 2 digit code for week. (LOS xx or NOR xx) The example they had was for a Firebird LOR.
Its good to see they got these right, I will be ordering some.
https://ecsauto.com/collections/gm-decals