If they are original likely 15x7. I don't think 15x8 was available on a 1971 Firebird.
Trim rings I believe are polished stainless steel. Not actually chrome, but your description of a brushed chrome is fairly close to how it could be described. I have 4 NOS trim rings in the box if you want me to take a pic of one I would be happy to, for you to compare to yours. I can also give you the part number off the box if it would be of any help.
Chad
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1966 Ford F250 Deluxe Camper Special Ranger Custom Paint - San Jose plant
http://www.ford-trucks.com/forums/12...al-ranger.html
1966 Ford F250 4x4 Red/White 4-speed - San Jose plant
1966 Ford F250 4x4 White 4-speed - San Jose plant
http://www.ford-trucks.com/forums/11...-f250-4x4.html
1971 Trans Am White/Blue 4-speed limited options - Norwood plant
http://forums.maxperformanceinc.com/...d.php?t=757496
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