Are bed bolt patterns universal from manufacturer to manufacturer? I want to put a 70s chevy stepside in place of my 6' box. Will it bolt right up?

http://cgi.ebay.com/ebaymotors/CHEVY...QQcmdZViewItem

a bed like that.

Why do want to put a Chevy bed on a Dodge that's not cool your truck looks good they way it is.