Digital photo of Michelangelo Creation of Adam?

I need to make a print in a custom size (8x20) of Michelangelo Creation of 
Adam.  Not the complete picture.  Just the 2 hands touching fingers.

I've googled until my fingers are worn but I haven't been able to find a 
source for a HIGH RESOLUTION digital version of this picture.

I'm not too picky but even at just 200dpi that would be 1600x4000.  I 
probably need an even larger original as I need to crop it to a 8x20 
panorama frame.

Anyone know of a source where I could get this file?

Thanks.
Bruce.