The two on the bottom, GS 455 and Stage 1 are from Dr.Decal. Very bottom is NOS. The other Stage 1 is “GM official licensed product”. The other two are something from “Bleis Nostalgia Decals”. Dr.Decal is lighter red as NOS and better detail. Just thought I would post for comparison. Red matches sets.
The Northeast GS/GN club sells the best decals available. They are embossed like originals are. http://v8buick.com/index.php?threads/northeast-gs-gn-air-cleaner-decals.237631/