small block ductile iron adjustable rockers

Hey Guys, I have a question about factory adjustables. I have a used original set that I pulled years ago. It has the banana groove shafts. the part number on the side starts with 24. I have another set that's slightly different that has w30 stamped on the side. I think Crane made iron adjustables in the old days so could the w's be Crane or something else?
Someone school me on these. I need to figure out what I've got so I can figure what to take to the Nats.
Thanks in advance:downtown: