Need id on oil bath air cleaner please

I bought this 2 bbl oil bath air cleaner at a swap meet today. I was told it was on a 55 Chevy, but it doesn't look like one I have ever seen.

Anyone know what it was originally on?

Thanks

 

looks like 56-57 chevy

 

I had a 56 Chevy when I was in high school, but I don't remember it having the openings in it like this one. Of course, I have slept a time or two since then.

 

Yup, '56 chevy. Here 'tis

 

Well I'll be. Thanks