Ceramic wheel bearings


hey i am looking for ceramic wheel bearings for a friend he's got a 01 busa, is there a company that anyone knows of that sells them specific to the busa or does anyone know the actual id x od x width size of the bearings. any help would be greatly appreciated
cool thanks for the reply.....has anyone used or tried ceramic wheel bearings or know of some that has???....well how did they make out did they feel a difference, maybe a better 1/4 mile time???
There is one person i know on this site that uses them...but he has so many other mods theres no way to tell if they helped him..got'um in the motor and wheels,nitrous,etc..who knows what else....plus a very cool paint job..hehehehe