According to RockAuto, the bearing is a 302CC (an industry standard part number). It's the same for early Gen1 alternators as well in the 60-70A range. They show a 303CC bearing for a larger 110A alternator.

These bearings can be found at local bearing suppliers as well as online at places like RockAuto and even Amazon.

You'll pay about $15-20 though.

Jim