The same reason that there are like 5 different axle nut sizes.... GM is stupid.
Paying someone to install parts and bragging about it being fast, is like watching someone bang your wife and being proud to raise their kids.
true enough, i have five 14 mm and on 15 mm nut on my head. and yes, that was from the factory.... go figure.
I'll eventually take the time to put something here. I swear.
Mine were T50. And on a 15 year old MI car, They weren't pretty. I got 3 out using wrenches, Got sick of it and drilled out the other 5. New hardware ftw.
