From my search of Pioneer ttables it looks like your table accepts standard mount cartridges. You could certainly replace the cartridge with a Grado cartridge. If the cartridge has no markings or name it would be hard to find a stylus. If the cartridge is old you might be better off with a new cartridge. Hopefully you received the instructions that show how to mount a cartridge if you have never done it yourself. If you have an audio store locally that sells cartridges most that still sell them will install. Some good sources for cartridges and set up tools along with advice are www.needledoctor.com and www.turntablebasics.com.

If you can find any markings on the cart or post a picture we might be able to help further. Welcome to AudioReview.