Green antifreeze or coolant as some call it.

Look for 'conventional' or 'IAT' on the label. Another thing to look for is a chart that shows its spcifically for older american cars.
https://images.oreillyauto.com/uploads/pdf/ad/SD_672 AFZ Comparison Chart-1.pdf

CONVENTIONAL ANTIFREEZE | GREEN ANTIFREEZE | FULL STRENGTH