Good diagram here:
https://www.machinerypartsdepot.com/...57/page/547181
Very friendy, helpful folks too. They know Bridgeports and get parts out ASAP.
In lieu of that, measuring the ID (1.375 IIRC) / OD (2.375iirc) , how thick, thrust, etc and contacting a local bearing supply house can get you fixed up too. Pretty sure they're all spec'd abec-7 / sealed.