Ok, so I looked into this.
The attached picture is of my car's original hinges and one extra).
I was able to clean them up, and find the paint marks, as well as the 524 & 525 stampings;
Finding the paint markings was a genuine surprise for me...
My car was built the first week of June, and the coils on these hinges (middle and right) are the small (28 count) coils.
The extra "1970" hinge in my collection is stamped with the number;
It comes from a pair that was repainted black, but with a little cleaning I was able to find trace blue paint;
This hinge has the larger 25 coil springs.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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