Hang on - let me read my post again and then go and look at the rims on my car in the garage........
Nope, mid-80's Soarer (MZ20/GZ20) are 15 x 6 20mm offset 4 x 114.3 PCD, and they fit fine on Corona hats bolted to Pug rotors on Corona struts with Hilux calipers.
The 30 series Soarer's, released in 1991 I believe, are 5 stud rims.