You'll need a bearing kit (around $50), fluid ($20), and friction modifier (cheap, maybe $5). Go to
www.fordracingparts.com and click on "Where To Buy." I found a good place in NJ that is licensed by Ford and was aware of the many issues with Motive gears, so he got non-motives by Ford. It's been mentioned by Sancho that U.S. Gear makes the Ford OEM gears, so that's probably the type being installed on my car within the next week.
You can get them at other places, I'm just offering my experience.
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06 Redfire Auto V6 Premium w/Pony Package
FRPP Dual Exhaust | FRPP 3.73 Gears | FRPP T-Lok | C&L CAI w/93 Evo Tune
Sig courtesy of black_89gt