Do you have any close up pics of the front bumper, especially the chassis mounting. Also any details would be helpful I'm thinking about getting rid of this chessy stock bumper, and yours looks pretty close to the design I have in my head!
Take a look at the "Bumper Project" page at my site (in the signature below) for pics of a common bolt-on mounting method. Scroll down on the Table of Contents frame on the right side until you find it.
It has a number of pics in it so it may download slowly if you have a dial-up connection.