Aluminum sliding window bottom roller module, made of nylon with two wheels. Body of module 34 mm x 10.4

There are two modules on the bottom of the sliding window. Each module in a nylon frame with two wheels that snap in. the wheels measure 13.5mm Diameter x 5.8 mm wide. they have a molded axle that is 6mm in diameter. Around the top of the frame is a molded on bezel that keeps the snap in module from falling into the 35.15mmx 10.27mm hole in the window. the module also has ears on each end that retain it in the hole.

I believe it is part# 87-190. I will order and give it a try.