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Someone in the Driveline is selling these for $10 each. They show up on eBay occasionally too.
Your least expense option is hit the salvage yards and look. This takes a long time, but if yuor not in a hurry, your probably going to be out there looking for something else eventually anyway.
If you have a old filling station or tire shop near you, they might also let you did through their weight bucket.
...that my car was exeptional in that all 5 wheels & tires were perfectly balanced as installed at the factory and therefore, needed no balancing weights... dc
Gary Beaupre wrote a nice article about wheel weights in the Winter 2005 edition of The Restorer. His focus was on midyear wheel weights, but chances are that the same info would be similar for a 72.
While Micro "birdwing" style weights are perhaps the best known, there were four or five suppliers to GM during that period. Manufacturer logos that should be acceptable to the judges include Micro, Arrow-with-P (Perfect Equipment Company), LH, OEM, and 14 (Speed Clip).
For midyears only five weight sizes were used (0.5, 1.0, 1.5, 2.0, and 2.5 ounce). Furthermore, the weights should not be marked in grams, and will typically be marked in ounces on each end. I believe this would be true for 1972 as well.
Just my own observation, but other than on the spare wheel, I have yet to see an exterior judge crawl under a car to check the originality and authenticity of the wheel weights. The factory applied weights only to the inboard side of the wheels, and so those weights seem to earn a "pass."
Patrick
Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.
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