Does anyone know if I can get these anywhere?

If you are talking about stock wheels, to my kowledge they did not come in 12 inch width. Somewhere I have seen some company that offered look alike wheels to some vette wheels in 12 inch widths but I can't remember who it was.

Time to google hard.

I have seen the Z06 replica ones here
http://www.corvettemike.com/shop/?vcat=Wheels-Replica&pf=10004

heres an 18x11 in this style


http://www.radicalwheelsinc.com/index.php?act=viewProd&productId=45

sorry not much luck surfing for the 18x12