Hello, Robert. In fact, this does look familiar. Please take a look at our 87-212 sliding window roller. Please let us know if this is what you have been looking for.
A professional from CA says:
March 2, 2017
Unfortunately it looks like the window frame has been worn to the sides of the axle. New wheels may wobble around in the slot. They may work nicely, and at the price it's probably worth the gamble. I never make any promises with this type of repair.
A professional from CA says:
March 2, 2017
I would try swapping the top and bottom rails. This will put fresh aluminum slots for the wheels at the bottom.