Too funny. Makes me laugh at some of the assumptions I make at times.
I guess I was thinking something like a 2014 Mustang, but when I went to look at a spindle for one I discovered that 1) they use a strut and 2) they have a stub and not a bolt on wheel bearing hub assembly. I thought the Mustang had gone to a bolt on cartridge assembly like the C5 or C6 Vette, but they never did. I also thought they got rid of the struts in the later models and it looks like they are still using it.
So (in my mind), the idea of using a Mustang part to make the bolt pattern easy is out the window unless some kind of adapter could be made to use an upper ball joint on a strut spindle.
And I am a fan of keeping wear items like wheels bearings unmodified. That way if you have to replace a part for some reason, you just go to the auto parts store and buy it and bolt it on. Modified or custom hubs mean you have to wait for the original supplier to send you a new one or find a place to machine yours. I set up my BBK to use off the shelf Cobra rotors for this reason.
I guess a C5/6 spindle and wheel bearing/hub could be used if someone didn't care if they needed to get custom axles with a GM bolt pattern for the rear and buy all new wheels. But my gut says that an off the shelf Vette spindle won't work and it would require a custom spindle that accepts the Vette wheel bearing.