Though I still loved the car, loved it more when I got an actual motor under the hood, and will soon love it even more when I get my latest project done, there is not only the no apparent reason for what is metric and what is SAE but I got a free 10mm socket on a short extension that was the rattle inside the PS door, there is the whole SSIIIs are FREAKIN' JUNK thing [VERY poorly fab'd wheels], and my special order 442 showed up with silver paint stalactites all along the bottom of the car it had run so badly from front to rear. I was tempted to have it shipped back for a do-over but was told "there won't be a do-over . . . that just means you don't get one" so the dealer had to strip and repaint all the silver on my brand new car. Was also told this was a deployed quality phase at GM where individuals were now responsible for their own quality and, though I have no idea if painting was robotic by then [probably was], something clearly went wrong and no one cared enough to have it fixed before it left the factory.
Seriously, paint-cicles? You are going to ship a car with paint-cicles on it? Yup . . .
So . . . having a rear end that has SAE diff cover bolts and metric wheel studs? I can live with that. Should have just pulled one and checked it before I ordered the new cover bolts but knew they were "supposed to be" metric and I even used a 13mm to take them out. Of course, a 1/2" worked even better . . . going back in with the new metric bolts, however, was a problem! Fortunately I didn't force anything.