Bit of a long shot. Has anyone seen this shaped window.

[Linked Image]

On another type of car ?
Reason whilst messing about in the back with the tool tray out, I nudged it with my shoulder & it popped out.
Seems the seal has perished, now with the lip missing. I am trying to source a new one or something similar.
COH Bains have loads but not that shape. I suspect Morgan would have used one off another type of car.

4/4 Ivory 4.1:1 axle, Mercedes A200 AMG