15" GL Sport rims, six-spoke.

What is the inside diameter of the center hole and the angle of the lug nuts? I'm trying to find out if I can get these rims to fit my Saab. (same bolt pattern - 108mm but Saab has lug bolts)

Also, what kind of centercap fits on these?

Smaart Aas Saabr ---------------- 1990 Saab 900S 16v 2.0 I4 1976 Pontiac Firebird 16v 400 V8 -Founder of the Coalition For Manual Transmission Availibility In Motor Vehicles-