Where to find this window track (70’s era?

Anyone know where I can get this aluminum window track. Windows are 1 3/8 thick.

Tried a million searches with know luck.

 

Why?? Something wrong with that one?

All kidding aside, it's almost unrecognizable.
Could an aluminum extrusion company (think house gutters) help out with this?

 

They used them years ago. When most people got rid of the window weights and converted to a more modern sliding sash window.
It looks like a “w” or double “u” with pre bent clips behind the center rail that put tension on the window.

The only time I’ve seen them is when we tear out windows and toss them in the trash for a full window replacement.

i had to make new sashes for a historic home and was looking to get new tracks. I can reuse this but was hoping to replace them.

 

Check with a window replacement company, maybe you could pick through the windows they replace and find some.