Door window hardware - what's this

[blown motor]

I took my door window out today and this little rubber thing dropped out of somewhere. What is it for/where does it go? Also the two washers fell out from somewhere. I think they were in seperate locations. Could someone have put them in somewhere as spacers to help with adjustment. I'm wondering if they were behind the vertical tracks at the top.

[JayBee]

That rubber thing looks like it goes on the end of the regulator

[blown motor]

I didn't touch the regulator but the rubber is broken so it could have fallen off. I'll have to check it on the other door.

[anlauto]

The washers are not anything factory Those rubbers fall off all the time

[blown motor]

Are they important enough to need to be repalced?