Great! I was sure someone would have it. The instructions I have for 3904 are from 2001 and 2003, so yes, the blue/blue combination was indeed the original. I'll add in those parts (didn't have the battery-cover, either) and if you could scan for me the full instructions I can keep my sources organized. Thanks re: better pictures, by the way.
Does anyone have 3166 instructions showing this part? Just being thorough.