Need to identify and replace lower window sash pivot shoes

This window is an Alliance window installed circa 2004. Original contractor has shut his doors so I do not have specific information. There are no tags on the window to identify series, model or serial numbers. You have a few pivot brackets that appear similar, but the dimensions are off. If you cannot match this pivot bar, what options do I have to replace the pivot bar with a new matching shoe?

The windows are double hung with the tilt in feature if that helps.

Thanks,

Chris 

My son has the same windows and has ordered these before. They fit and he can install them for me.