I purchased all the pump parts from John Deere. While they were not the cheapest but they all worked perfectly. Basically they use this pump on a z425 Below are the items with the John Deere part numbers.
So here is what it looks like.
1 - (14M72278) Left handed metric nut for the pump pulley.
2 - Pins (34M7127) for the level arms (to control the pumps)
3 - Lever arms (M154430) to control pump. While these could be built at $12 each this may it very easy.
4 - Below are two pulleys/sheave listed (TCA14218-$54.67 and (TCA13087-$28.02). I went with the cheaper one but it does not have a keyway cut. The hub is tapered and I started to file a keyway but during a test fitting of things I had trouble removing the pulley I figured I could live without the keyway for now. It hasn't loosened yet. I think the more expensive pulley has a keyway but am not sure.
Bernie