I am not sure where your confusion lies but a 15-inch rim and a 16-inch rim only differs in diameter. That has no direct effect or relationship with the width or offset of a wheel.
My wheels are 6½ inches wide with a 42mm offset. They do not stick out on my stock 1302 fenders. In fact, I have 6mm spacers on the front and 8mm on the back.
There is a relationship with overall widths and diameters of tires thanks to the aspect ratio of tires.
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(2004-2008): 1971 1302 w/2056
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