go on a site like CMSL https://www.cmsnl.com/ search your ike, then search the fiche for the part number. then plunk that part number and maybe your bike model into the googler...
when searching for a specific part. Always search by part number.
But truthfully, if you are just looking for ONE ball bearing for that part. Find the size, then go to a machine shop or mechanic shop supply store. Or even a fastener store.