Bought the power wire upgrade from Lethal, its a PA part. Its a nice 4 guage wire upgrade with a 200A fuse built into it to replace the fusible link you remove when installing it.
PA Performance 99-04 GT 4 Gauge Power Wire Upgrade Kit - Alternators - Ignition - 03-04 SVT Cobra
The alternator I bought from Start N Charge included a 2 gauge, 200 AMP fused, power wire kit. I am assuming that is still the case, but it has been over 3 years since I bought it.
Here is his old thread on Mod Fords Linky.
-Brian