Springs to raise rear on 72 malibu

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I have a 72 Malibu with oversized tires on rear. It has air shocks but I don't like relying on them for the 2" raise I need. To much load in the wrong places and I think springs would be safer and better ride. The only springs I can find on line is original and lowered. Are there any springs that would work, station wagon etc? Has anyone used the fixed or adjustable spacers that are installed under the springs?