Look here https://www.penturners.org/forums/completed.165/. Sorry this link didn't work correctly, but there is a whole list there of what those item numbers mean.After A very long time, a lot of years.
I pulled my moulds out but cannot remember what kits they are for.
Hoping someone has a good memory and can help me.
Yep that is when I bought some. Used them for awhile. Now I just do the tube casting.