What can I cover the bottom panels of a 540 with

Greetings,

I have a 540 that is placed horisontally. It suited me better to have it like that.

See image:

http://www.conram.com/pubimg/05.jpg

Recently I removed the 3'5" HDD fasteners as seen on this image:

Now I have two holes in what was the bottom of the chassi but is currently the rear of the chassi.

Any ideas what I can put there that would fit from Corsair Accessories?