mirror side glass motors

I was in the process of replacing the side mirror glass on my e46 the other day and I noticed that a white part inside the motor was broken. The part fell out as I removed the glass and now the glass is not sturdy. It shakes while driving. Since I wasn't very clear, here is a picture of what I...

Pair OEM power mirror assemblies, includes housing, motors, mirror caps, and glass mirrors from facelift E46 sedan. Mirror caps finished in OEM titanium silver. Passenger mirror glass in excellent condition, driver side glass has some rust along bottom edge. Driver's mirror cap has some clear...