Door Window Part

Can someone tell me what this part is and where it goes?

This is called a 15745334 - GM STABILIZER ASM-FRT S/D WDO. I need to know where it goes. Please help!

If you haven't found it already, look at Item 21:

http://www.wwdsltd.com/files/2002GM-CKDoorHardware.jpg

Sorry for the late response but thank!