Correct Air Cleaner for 72 340 Demon?

I'm new to the Demons, and need to know the correct air cleaner for the 1972 340 4 BBL....... or maybe they used more than one design in 72....... I've seen pictures with small ones like the 273 4BBL design, and big dual snorkels. If you have the correct info, please let me know.......... Thanks guys. Doc Marino