Just replaced mine, i used NSK EP30BD6227T12DDUKC01
MA6L 908
These are a good quality Japanese bearing
Take Care when removing the retaining bolt in the centre of the bearing, i think its the lower one that is a left hand tread, have a look at the rotation of the pulley before removing the belt, you will see which one rotates anti clock, that one is the left hand thread.
Alberta Canada
1995 Marathon XL #326