Differences between 273 Commando Silenced Air Cleaners?

All Barracudas were built in Michigan -- cars destined to be sold in California had the CAP package, the others did not. I imagine the Darts built in California were the same way. My Barracuda was sold in Oregon to a Washington customer, for which I'm grateful, as I can avoid dealing with the rare CAP parts.

I must point out that Barracudas were also assembled in the Los Angles plant. I have a 66 with VIN: BP29D65xxxxxxx. The "5" indicates built in Los Angles,