Re: FYI on bolts
Bearings are in the same boat as nuts and bolts, o rings, etc.
Manufacturers don't go out and get special bearings made, Deere maybe but most manufacturers use common bearings, be it open, sealed one side, sealed both sides, ball, roller, taper, etc.
I found the bearings in my JD 60" deck spindle were the same as a 6205 open both side bearing that can be bought just about anywhere.
A screw gauge is almost a must with metric, SAE, course, fine. A micrometer would be useful also.
As Steve says above, do your research, sometimes the size is listed but a lot of the times, it's not.
2000 John Deere 455
1991 Ingersoll 4018
1988 Cub Cadet 1720
Cub Cadet 1320
Murray 13.5 HP
Gilson Rear Engine