I received the correct headset from GT on Monday and raced it at superweekon Tuesday. So far I have ridden it for 3 days and I'm liking it quite a bit. The correct headset was the FSA ZS3.

"Cane Creek compatible Shallow Alloy cups fit into 50mm OD headtube
Very low profile designed primarily for ATB’s
Patented alignment tip for increased durability and performance
TH brand 36/45 degree Micro Angular Contact Bearings (blue seal)
7075 aluminum crown race
Laser etched FSA aluminum top cap
Stack Height* - 9.8 + 3.3 = 13.1mm
Black anodized finish
Weight - 80 grams (1 1/8")


The FSA ZS3 stack is designed primarily for mountain bike use and featues steel cups that are pressed into an oversized, yet simple design headtube. Other than diameter, a special headtube is not required for this model. The bearings used in this model are our high quality Angular Contact Bearings which offer precise steering and long life. For the customer who desires a internal type headset for their mountain bike line, this modEl is very high quality, safe and trouble free."