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The 2004 CAD drawing I have shows 49.2" to the bottom and 61.4" to the top. I know the 08/09 mirror is a different shape, so I tried scaling the pdf drawing by holding my ruler up to the monitor. Closest I could estimate would be 49.5/50.0 to the bottom and 63.5/64.0 to the top.
The measurement to the bottom is more important, so I'll have to make sure I keep obtructions below 48 inches. I'm looking into changing the garage door linkage (old swing up style door) for a bit more clearance.
I now have a confirmed build date of Feb 12/09 (special thanks go out for this info).
The measurement will change depending on a lot of factors like suspension setup, tire selection, and suspension upgrades. It's going to be really hard to get an accurate reading.