David S., as far as I know the 38" and 42" cast end decks only used two decals. I don't recall ever seeing a 38" or 42" cast end or stamped deck that used the "Do Not Step" decal and I believe only the stamped decks used the silver triangle decal. Here's a cast end deck with the original decals.
Here's a stamped deck showing where the silver triangle decal is placed by the discharge chute.
Here's a stamped deck showing where the silver triangle decal is placed by the discharge chute.