Anyone know what size bearings are in the rear wheels of a 07 Dragon???

Have you tried asking your dealer?

You never mentioned which rear wheels... The far rear ones, or the mid-idler wheeels. They sometimes have different sizes. I took my wheels out of the sled, and popped out the bearing. Took them to a bearing supply shop. The bearing will have a number on them. Bearing supply shops have tons in stock (no waiting for ordering from a dealer) and they are cheaper. Just my two cents

Either 6205 or 6004 , bearing trade numbers.