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The dates are stamped on the rim. Most restoration books have the correct dates for your model year. I am sure some forum members will chime in with the dates you should be looking for. You should post the trim tag dates to help this process...
Are these OEM wheels? I can tell you the Z06 OEM wheels are Speedline and this and a date are cast into the back of the wheel where it mounts to the hub.
You don't want to buy 'repros', but you'll buy 'midnight specials'? Unless they look like they have never been installed on a car, I wouldn't touch them [with a 10 foot pole...or a 9 foot Canadian].
Happen to have an 06' ZO-6 with two set's of wheel's. The second set are 08' OEM take off's purchased from another member for track use. Just checked em' and hub casting imprint's read Speedline Italy, with a GM casting imprint in the spoke. The one's on the car are Amcast America, a Speedline division, but closed up shop and kept everything in Italy. Not sure of the marking's on these.
Are these OEM wheels? I can tell you the Z06 OEM wheels are Speedline and this and a date are cast into the back of the wheel where it mounts to the hub.
Call your Chevrolet parts department and ask for the GM part number for the 2010 wheels. The ones you purchase should have the same part number on them.