H&R spacers on a T2

[kra710]

I came across these a while back and now I want to outfit some turbo twists on the bus.

Im worried about clearances. If the spacer adds 25mm, and adapts for a porsche 5x130 wheel. What is the widest wheel that will clear the bus.

Im assuming that I will probably have to throw together a set of two pairs of 17"x7" front wheels off a 911

Any thoughts, or does anyone know of where I could purchase wheels individually?