Need help purchasing correct parts for clutch replacement, can anyone help?

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Searched for correct parts but do not know which version I should be getting: Clutch Flywheel Ring Gear - standard, flat, 132 teeth or MTX / Flywheel - flat or 20 teeth/splines. As far as the clutch kit goes I don't really know what to look at as a deciding factor. I tried to get a more complete description and specifications for the parts on the fordparts.com site but that wasn't any help either. Since I'm living on a partial pension I can't afford to buy the parts from their site but I don't want to order the wrong parts and get hit with return shipping & restocking charges either.