Have 28 year old white aluminum awning windows in my home and the bearings were disintegrating. Anyway no labels or markings on the windows but this bearing was a perfect match. Located in Cocoa Florida. Bought two to verify then ordered enough for the whole house, they are easy to change out in my case.
My lanai has awning windows manufactured in the early 70's. It's impossible to find parts. This company seems to be very knowledgeable. Shipping prices are a little high, but they are probably the only game in town.