parts for new custom dogbox

I'm considering building a custom box for a trailer I have. It seems that awhile back I found a website that sold doors,vents and other prefab hardware for dog boxes. Does anyone know of a website or company that sells such things? I would like to have these items figured out before starting to build.

Dogboxparts.com has a few things

quick google search brought up these sites:

http://www.dogboxparts.com/

http://www.deer-creek.org/parts

Austin Hardware also has some good stuff

http://www.austinhardware.com/index.cfm

Thanks! Deer creek was the one I had found in the past but couldn't relocate it. That's what I needed.