Help to ID a broken (window) part? 2000 9-3 Viggen Convertible

[BayAreaRick]

2000 9-3 Viggen Convertible

Heard a 'thunk' in my drivers-side door when lowering my window, knew it sounded semi-bad but the window still goes up/down. Opened the door-panel today and discovered this broken 'plastic' part at the bottom inside the door frame. Believe it's related to the window mechanism but can't figure it out, also can't find the part on esaabparts.com or eeuroparts.com.

Window goes up fine. Seems to go down fine but - maybe 1/4" further than it should (doesn't match the passenger-side window at rest), and with a little 'thud' (thinking it might be some sort of 'window-stop' that should be attached to something in the door or window mechanism). Pics attached

Would appreciate it if someone know, let me know what the part is called, maybe even ID it on esaabparts.com? Advice?

Thanks in advance.

Rick