

I’m not aware of any that are kept reliability in stock. You can get new sticks, gears and bowls (plastic ones that will have the same problem over time, but much cheaper). I would get new sticks to go with these bowls. https://store.kitsch-bent.com/products/n64-joystick-thumbstick
No guide but it’s pretty straightforward. I used this kit for the shell/screen/battery is here and the regulator is here. For the regulator, you should have some experience desoldering pins.