You can swap an 03 in no major mods, just have to replace the pedestal that supports it also. Different mounting.
I got mine from IDP, not a normal item he carries, got it just for me.
But, they pop up on eBay and other places. 300-500 seems to be the average and about 200 for a pedestal from Ford. I have the part numbers from Ford if need be and a hardware kit ($8) that makes it nice as it provides new o-rings and and the nuts and bolts you'll need.
And running the same tunes, I gained 4lbs boost and felt like a stronger, smoother spooling.