If you follow the link I gave in my last post and click on the 'top mount' selection to the right, you'll see what I'm talking about. The track is easy to install and is a permanent fix.

As I said, I've never seen the track you have, but what I'm recommending will do the job.

When you get the new receiving track, let me know and I'll tell you how to install it and what to watch out for - and how to get the liner into it