Scott,
I didn't realize there was a plastic rack until you mentioned it - I have had no problem with it. I just took a look and discovered that it will come off. I set the plywood directly on the plastic "L" part and use it to contain the plywood and my music.
I use the "upper" holes to attach the wire rack. The rack is spread a little so it fits in snugly.
The small lamps that I use have no brand name that I can find. A "GG9644" is stamped in the plastic clip. A small sticker attached has "E107841" and "portable lamp issue #BG-60,847" on it. It uses a 25 watt reflector type R 14 lamp. I use two of these, one on each upper corner of the plywood. Works well for me.
Have a Happy New Year. Walt