Camshaft and eccentric ring 1 or 2 pieces of key stock

It's one piece. If you go to a local hardware store (like Ace) in the fastener aisle there is a drawer with key ways or "woodruff keys". They come in different widths and lengths. Bring your cam there and pick out the one that you need.

I had to buy an extra long one to fix a Hughes engines cam nose adapter kit that they designed poorly.