I have a Rock-Ola Princess Royal jukebox. When I got it, the needle was royally screwed up. A replacement stylus for the cartridge that was in there was kinda hard to find, so I just replaced the whole cartridge. It's just a standard half inch mount phono cartridge. I used a Sure M25C if I remember correctly. After replacement, I readjusted the tracking force to compensate for the newer style needle (older cartridges track at 5 grams, the newer one works better around 3). Worked great, and it was only like $30. I got it from Garage-a-Records.
-Ian