If you keep your existing 'powerdome' hood, your good looking option for a scoop would be getting a 99-04 Mustang GT scoop. Drill your hood for the mounting screws, and trim up the 'grille' to fit the cutdown in the middle of the hood. Best solution if you want to use your existing hood. The 'grille' on those 99-04 GT scoops are plenty tall enough that you can trim them to fit perfectly in that groove.
If you put a SLP/Roush Thunderbolt scoop on that hood, there'll be a gap between the grille and the recessed center of your hood.
The hood on Thunderbolts are the same hood as what's found on 98-00 rangers and 01-03 XLT and XL 2wd models. And yes, it'll bolt onto your truck. Though, you will have a bigger gap between the honeycomb grille and your new hood. The scoop is added on.
'01 XLT disguised as a '03 Fx4 Level II.