2002 Tacoma Rear Right Power Window Regulator

2002 Tacoma PreRunner 4dr Double Cab TRD 2WD Supercharged 3.4 V6
I'm having a problem locating a replacement part that rusted out on the rear right window regulator assembly. The regulator itself seems to work fine.
I'm unsure of the name of the part, but there is a bracket/channel bolted to the top of the regulator that the bottom of the window sits in. The channel has rusted so badly that it's no longer connected to the window. Not sure if the window is supposed to be fixed in the channel so that when the bracket comes down it pulls the window with it? It doesn't. The bracket has dropped and is no longer attached to the window.
I haven't been able to locate a regulator that looks like the one i've got other than a manual regulator. At any rate, the power regulator works fine, i just need to find the removable top channel to replace the one i've got.
Any guidance anyone could provide would be appreciated.
Thanks for your help

 

I think that's part of the window. I guess the sealant let go. May be able to buy it separately though, look on a parts diagram.