Not 100% sure what you mean by "lever". The stick is a Seimitsu LS-32-01 I bought from Arcade Shock, so the actual lever/shaft part is whatever the stock one is for that stick assembly.

The knob is a random cheap bat top I bought off amazon because the ball top wasn't working for me. Here's the listing. I think I prefer the bat top for the precise movement you need in shmups--doing brief direction taps to nudge your ship just a few pixels is a lot harder with the ball top.