These deceptively simple components are manufactured in different sizes and shapes for specific applications; the type of wheel and vehicle specification dictates the style of lug nut that’s used.

So, it’s just not safe to “make do with four lug nuts.” Although my wife keeps suggesting I try it. Also, since you tightened ...

As for the actual lugs that bolt the wheel to the axle ... the Pontiac 8-lug wheels are still widely available in different sizes from third-party suppliers. However, if you're set on genuine ...