rallye wheel width/bolt pattern?

Anyone know what the width of these rallye wheels would be? They are 14-inchs that go on my '74 duster with
8 1/4. They have been on there for a couple years and I can't remember what bolt pattern they are. But I believe they were originally from 1971 because when I purchased them they had the dark argent center caps. Does anyone know what width the factory used back then for 14's? I am guessing it's 5.5, but not sure. Would the number be stamped on the back of the rim?

Thanks
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