Originally Posted by canopus

Get snarky and you get less answers...
Provide the Year, Make and Model of your bike.
To us "seniors" a headset is the full monty... cups, bearings, races, locknuts, washers. Comes in package, everything works together. As other have stated it appears that you are looking for bearings only. Well, no one can assist you without complete measurements which you didn't provide.
The best thing would be to just replace the entire "headset" and not the "bearings". Then the only thing your really have to determine is, is it threaded or threadless? Is it 1" or 1 &1/8"? then purchase the appropriate headset and replace all of the parts listed above.