Bearing Identification

[Rob-D]

I am in need of about four flat idler pulleys. They are no longer available and I have searched extensively! All have bad bearings that are sandwiched between the pulley halves. I removed the rivets and found the ball bearings have no identification numbers.
They are 1.575" OD by .500" thk. and the ID is 3/8" that a 3/8 bolt passes through.
What do you call a bearing like this that doesn't have a precision ID?

Bearings come in standard sizes. What's best is to find the number on the bearing itself. Does it have shields? Usually the bearing number is on the shield. The other question I have is how are you measuring the bearing? Did you use a micrometer? If not it may be a metric bearing. Is the bolt metric or inch, are you sure? Chances are the bearing is readily available but we need to know the exact dimensions especially if it's pressed in.

Rob