2007 SR5 Tailgate Window issue
 

Hi I have a 2007 Sr5 V6 4WD Sport, US model purchased in 2008 in Canada.

Looking to repair/replace my tail gate window track.
Track is rusted out, motor works fine, glass is fine. I opened up the back hatch only to find many pieces to the assembly. Does anyone know if the assembly comes as one of is many pieces, the dealership and local auto parts stores all seem to not know.
If anyone has replaced this please let me know the degree of difficulty as well please (seems very tight space)
Suggestions are more than welcome..
Thanks ,