Help identify window roller parts.

Hello:

Attached are five photos of the double brass rollers with plastic housing from my metal framed sliding glass windows. No names, numbers, or markings found. The brass rollers are 3/8 inches in diameter. The windows were purchased and installed by the home builder in late 1990, brand name unknown as the stickers fell off long ago.

I need to locate and purchase replacement parts for ten windows. Any assistance you can provide in identifying the correct replacement parts will be greatly appreciated.

Thank you.

Mike

Paul:

Thank you for your help identifying the part for my windows. I will order the 87-181 parts and give them a try.

I appreciate your help!

Mike