could be SGT but I don't remember GM springs having the tighter pigtail on one end
64-87 chevy look like those 14x5-1/4.I know they make one about the size of your finger for the 64-72 and the thicker ones for 3/4 tons. Seems the 73-87 run thicker on the half tons.
1st pic is 73-87,hard to tell but the 2nd is a 70 and is a little smaller in thickness.
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