Novi 2000 ceramic bearing P/N

Hi, I'm a noob here. I tried to find a P/N for ceramic bearings for my Novi 2000 but failed. I looked on E-bay and saw a set sells for $550.00. I shoot the E-mail to the guy to find out the P/N but he would not tell me. Anyone here knows. please help?? thank you.

Find a local motion industries and take your bearings into them and they can cross refference them for you. Probably be the cheapest place to buy them also