For the most part, the letters and numbers beyond the "6802" or "6900," etc. refer to seal configuration and/or type or other special features.
For example, "2RS" is generic for "2 Rubber Seals." I'm not sure what "VRSU" means in this case--likely a factory specific code for the seal configuration. However, with suspension pivots, you generally want to keep two things in mind:
1) They are high-load, low rotation so a full complement ("MAX") bearing is going to be best suited (stronger compared to a bearing of the same size with a bearing retainer/cage) and none of the friction downsides of a MAX bearing apply because the bearings don't even do a full rotation.
2) Unless the bearings are designed to be re-greased using a grease gun, you want them sealed on both sides.
Regarding the basic bearing numbers, they are usually reliable, but sometimes manufacturers take liberties or get lazy and don't use the numbers correctly. For example, they may mark a bearing "6800" which would be a 10 x 19 x 5, when, in fact it is 7mm wide and is actually a 63800 bearing. For most bearing tools, the width does not matter and a "6800" tool can usually service a 6800, 63800, or 3800 (8mm wide). At least we make our tools deep enough to handle all the possible widths.
