Rear Window Regulator Question

[Cobra5]

Hi All!
I came across this forum after searching the web for info. Anyway I've owned this 1996 Fleetwood since 2002 and have been trying to locate the plastic guides that are part of the window regulators. Mine have been broke since 2003. Also as I was searching today I found a Buick site that someone posted a problem with the regulators on their Roadmaster. They posted a part numer 78187345 for the plastic guides. Can someone tell me if these parts are interchangable between these two vehicles and if so, where can I get these? I'm going to surf the GM parts sites to see if the part number will come up but I'm afraid that since the vehicle is 12 years old I may be out of luck and have to resort to the junk yards. In any case if anyone knows whether these parts are interchangeable that would be a great help as I will be able to expand my search for Roadmasters as well as Fleetwoods.

Thanks!
Tim

[jayoldschool]

You want 9666748. The round ones, not the old oval ones that break.