I ordered the entire houseing from B&H...,. I went with them b/c I felt like I would get the OEM version for sure. I didn't want to risk newegg, ebay or amazon where I might get something cheaper... I prob could have saved $30 but it wasn't worth the risk.
I had a busy day... finally got a chance to throw it in. My old bulb had 4K hours in smart-eco mode and still looked fine but I wanted a new one before football. I now have a backup I guess in the old bulb.
Well, I undid the housing to throw in the new bulb and tried to rip the old one out... I thought I was going to rip the thing off the ceiling...... Well, I saw the other screw and thought "He's an idiot. Comes from up-bringing...."
I even had the manual open (PDF).... I also remembered I read here there are two screws. Once I got the second one out, everything was smooth.. My OCD tendencies made me spend more time readjusting the mount but everything looks good now.