You cannot use the 605 pitman arm and you should not use the Trans Am pitman arm. You need a pitman arm for a 1979-1988 A/G body with the 800 series steering box, such as a Monte Carlo SS.
Here is one on ebay.
https://rover.ebay.com/rover/1/711-...0001&campid=5338652022&icep_item=220377692213
Here is one on ebay.
https://rover.ebay.com/rover/1/711-...0001&campid=5338652022&icep_item=220377692213
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