When I am running divers on the Cowlitz for Springer's, I am usually fishing with hearing, I usually use a double hook rig. Top hook is usually a 3/0 and tail hook is a 2/0 (a lot depends on the size of hearing that you are using). Use either a clear diver, or paint them all black. Why? Because many times the fish will hit the driver, and not your bait.

If I am using hearing, I like about a 5 ½ foot leader. If I am using shrimp and eggs, I usually make it a little shorter. I normally only use a single 3/0 hook if I am using the shrimp and egg combo because I use a threader for my shrimp. Don't be afraid to experiment, because it may vary depending on the color, height and fishing pressure.
As far as the diver size; I have not had to by any new ones for years, but the old size that I have used forever was 000! I hope this helps you catch a Springer.

Good luck,

Cowlitzfisherman