Dyno wheels. Porsche 986 option from '97-'99. 17x7 front, 17x8.5 rear. They have a 996 part number and were also listed as a winter wheel for the 996. They are the lightest weight early wheel made for the 986.
Mostly a despised wheel because of their unique look. I love 'em exactly for their unique look and have 5 sets for various projects.
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I think I have a Porsche problem...