passenger side external rear view mirror problem

[rt2]

This morning I clipped my passenger side external rear view mirror backing out of my garage door jamb. Mirror still tilts, etc., glass is fine but the plastic (?) mirror housing is cracked and seperated from the 1" black trim that surrounds the mirror. Note that mirror is from an 03 4.4 which does NOT have the folding (retractable) mirror option.

Questions:

1. Body shop job or dealer to deal w/ this?
2. Since the mirror isn't broken and the tilt/adjust mechanism still works as before i can I just order the housing and trim from whomever above and get things fix'd up?
3. Am I likely stuck purchashing the whole mirror assembly complete?