New memberUsername: Romic00
Post Number: 9
Bronze MemberUsername: Hemiboy
Post Number: 79
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=50565%26item%3D5778700441 %26%26Look here
Heres another box that may be ok for what you want.
As far as demensions, I have the same truck and you see how hard it will be to use (all) that space without fiberglass. Also dood ya might wanna check out this site as everyone there is a dodge owner and know exactly what its like not being able to get a box for the Quad Cab.