Fenders from the 99 truck and the whole clip from the 03. Splice fenders together and use 03 core support. There are other ways to do it but this way is how we have done all of them at the shop.
of all the conversions i have found...some are spliced to include the 2/3's of the wheel opening and others graft the fenders above the top bodyline.... more than anything im curious about the hood, and if it needs to be sectioned width wise
There is a build on here that briefly describes this mod. The hood is sectioned almost three inches which is cool because when doing it you also remove the body lines from the hood. Removing the body lines help the alignment of the grafting of the hoods.
The thread I was talking about
My thread on starting my conversion, I stopped once I got my wheels and plan on getting back to it once the fenders are all widened.