I've looked at those. They are rather small and made of hollow square aluminum tube, roughly an inch across. They are solidly bolted to the main frame, just like C5 &C6 Corvettes. However since they are such light material I strongly do NOT recommend using them as jacking points. They might be ok in a pinch, such as with the "bumper savers" but they have no capacity for holding the weight of the car for extended lengths of time. Play it safe - use only the factory recommended support locations.
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'74 Stingray coupe, heavily modified, as seen in August 2011 VETTE magazine, 2014 Stingray Z51 #196, ordered 02/11/13, built 08/29/13, Museum Delivery 10/04/13, driven daily!
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