240Z airfilter housing

looks like a 260z style one is yours a 73 mdl?

There are at least 3 styles of air filter housings for 240Z's

I've never seen this style? The square velocity stacks made me think 260z boat anchor style? Or 73 style?

Were lucky in Australia we just got the 1 style.

I don't know of that style either, never seen it before. I know of the one w/o the summer switch, the one with, but what's the third? Is it this one? why does it have the square stacks and big buldge? Inquiring minds need to know.