[fstfrddy]

All american car heater cores have a 5/8 and a 3/4 tube on them, they are easy to adapt down to 1/2 ID tubing. The hardware store guys will help you with that, just take it there. Just go and order the 77 bonneville heatercore from auto zone or one of the others, they are easy to find and are only 20 dollars.

 

[fstfrddy]

You can really use any heater core it is just that the 77 bonnie will fit two
120mm fans perfectly, that's why we use them.