The bearing shown in above photo would be ok for inside the chaincase but pretty much worthless anywhere else. Someone mentioned the 2RS designation to indicate two seals. He is correct.
Bearing Facts:
Z - a single shield on one side
ZZ - a single shield on both sides
RS - a single seal on one side
2RS - a single seal on both sides
650 Indy - The only Polaris bearing sizes I know of are 6205 2RS which is a 1/2" wide, 2" OD bearing for a 1" shaft. I believe all your idler and bogie wheels are going to use this bearing. For sure the idlers and wheels inside the skid. The later skids uses the 6205 bearing everywhere in the skid accept the rear shaft which takes a 6004 bearing. Its narrower, smaller od and fits an 11/16" shaft. Exactly why they did this, I have no idea. Seems a step backwards to me. Dont buy NTN bearings unless you have a source to get them cheap. Ive seen bearings with stainless housings going for FAR less money than the stealer wants for stock carbon steel NTN bearings. I have used Snowball bearings for the last couple years with no problems so far. Watch e-bay, you can get a whole lot 12 bearings for under 50.00 shipped. I buy in the summertime.