Probably a 6203 bearing.
Drill the rivets out, install a new 6203 bearing and use short 1/4-20 bolts to reassemble and you're good to go.
DSCN2683.jpg DSCN3327.jpg
Bearings do get a little pricey like this one that will last you probably another 10 years.
https://www.ebay.com/itm/6203-2RS-tw...QAAOSw2XFUkzG0