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A number of the cars have been found with the 10 bolt rear. If you ordered the base model 350/300 with an automatic you could have gotten the 10 bolt. Check the CRG website they have some info on this fact.
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My 05A Z-11 is a base TH-350 Auto and has the original 12 bolt rear.
I have owned the car for almost 20 years, So I must have one of the good ones...
Phil