Dan, I'm not positive... but pretty sure that the Dual snorkle was for GTO's and others, and that the First gen Birds had only the single snorkle aircleaners. In 70 it changed for the birds. (been trying to get some factual info on this)

So that is one reason the dual snorkle aircleaners go for a premium, as most GTO parts do! Good news is you can find the singles cheaper!

Your's should be a single snorkle with a chrome lid, H/D air A/C Delco filter still available at Napa.

Like I said, not 100% on this, but this is what I've been told by a few sources now.

Good luck - Brett!