Window Upper Arm with Track

Hello!

We have an older Lincoln Window in the 90s/early 2000s where we need to replace the upper arm/track. Would you have this part available?

The black piece that is attached to the window slides back and forth on the silver track but the track is now weak and the black slider just falls off the track and the top of the window is unhinged (dangling from the top).

Would you have this top piece available with the track? Also, is it sold as one unit and if so can you provide the link at your website to purchase this upper piece unit.

Attached are some photos of the piece we need.

Any info would be greatly appreciated.

Thank you!

Best,
Tom