I have an '84 K5. On the fiberglass topper, ive got the sliding rear windows. I need to find the CHANNEL that the window slides inside of. I tried LMC and the Local dealers but they dont have anything like that. WOuld someone like JC Whitney have something like generic channel that would work? The channel is pretty FUBAR right now, the window wont slide at all, cuz its all buggered up. Any help is appreciated.