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Saab makes a 15"x 6" steel wheels in a 4x108 bolt pattern, but the hub
center is a bit small. I would find one or a set of these before going
through the pain of widening 30 year old steelies. They should fit on a
spider or GTV, but I'm not sure the offset is correct to fit under a
Sedan's rear fenders.
I saw a boattail spider with Saab rims. Fit fine but looked
stoopid. Somehow when a car made by one company is fitted with standard
equipment wheels from another auto manufacturer, it triggers a
"recognition" conflict that never seems to look right. IMHO...