Hey nfhjr
I installed a front hitch, 'WARN front mounted receiver hitch W3666215' ?on my 2004 WBH in May 2006. It cost me $209.25, but I don't know where I bought it. I have it listed in my MODS book, but did not record the store I bought it from (Internet purchase).
You will have to cut a square hole in your lower plastic air dam (WBH or CLADDED) and they give you photos and dimensions to follow for the hole. The instructions are sort of cryptic, and you have to be CAREFUL to make sure you use the correct photo for the air dam you have. When they say SILVERADO they mean WBH AVALANCHE and when they say AVALANCHE they mean CLADDED AVALANCHE.
I spent a lot of time laying out the hole and measuring 5 times and cutting once so it came out great for me.
If you get one, contact me for further assistance cuz there are some 'tricks' to an easier install.
Here is a photo . . .