Identifying window lift rail?

Thanks for taking a look at this-

I'm restoring an older apt building with 90 windows, and have ordered dozens of parts already that you helpfully identifies in the past. Currently, I am needing a bunch of this part- which maybe called a lift rail. It is the part on the sash that both holds the insulated glass in the sash, and has the lip that allows you to lift the sash. (The length is not important, I'll need dozens of these in various lengths to replace broken or missing ones, I'll just cut to size myself)
Any help identifying the correct stock would be great! Thanks!