I have the rebuild kits, and all four original windows, but only one has this extra part I described. The manual refers to the stabilizer, but no picture of it. The windows are no problem to rebuild, but I can't figure out where the stabilizer fits, or why it is necessary. I can email a pic if intellectual curiosity is killing anyone.
I also can't figure out why the glass is not straight on the bottom at the rear-end, but has the curved plane. It slides the same straight as curved. Anyone know?