Thanks to everyone for the help.
Turns out I needed the "Left Track Guide."
Picked one up local at Bowtie Bits.
http://www.bowtiebits.com/store/stor...Category_ID=28
Sorry for the crap quality of the last pic...my phone was too low for flash. Also, I was under the impression that I needed long screws for the bottom, since that's what I took out. Turns out, not so much.