You will probably need a lot of fab work to make the 04+ brakes work on your truck. The 04+ expy is based off the 04+ 150's a totally different design compared to your truck. In the end it would be easier and cheaper to run wheel adapters.If the 6 lug rotors are a larger and thicker design, then it'll be worth it for me to swap. 04+ expy' are starting to hit the yards...
After reading thru the whole article, no trimming is needed. Just some longer bolts for one fender bolt on each side and lots of shims. Apparently the inner structure slopes down more than the new fenders do requiring lots of shims to get the gaps right.