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Those are 16 x 6" and 16 x 7"s, which did not come on a 1977 originally. Likely came from a 911SC, ('78-83), or more likely a Carrera ('84-89). There will be a 3 or 4 digit production date stamped in the back near the center bore. (month/year) They appear to have been polished.
I am hoping that they have been polished, not plated. Chrome plating (which eventually lifts/peels), destroys the value, in my humble opinion. Please post pic's of the date stamps and we can better tell the value.
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