Replacements are inexpensive. Tighten the top bearing race until it starts to inhibit the steering motion, Then back it up a tiny bit until it doesn't. Crank the ring nut down hard to lock the race in postion. Reattach your cables and you're done. Rectifiers are specific to the model and year of your scooter.
Most rectifiers are color-coded to make it easy to hook up.
Just match the color of the wire to the color on the rectifier. Some rectifiers are not marked. There are 2 different styles. P125X with serial numbers up to VNX1T 132954 and P200 with serial numbers up to VSX1T 76439 take a four-wire rectifier. Models after these serial numbers take a five-wire rectifier.