Track came off of the drivers door window glass

[splehigh]

Hey guys,

I bought a new regulator because my window would no longer go up or down. For a while I had trouble with it binding when trying to roll it down. When i took the door panel off I discovered that the metal track came off the window. Do I need a new plastic channel piece that goes on the glass? I can put it back in but the plastic is in bad shape in it doesn't fit very snug. Where do I buy that plastic piece?

Thanks