Well in case there was anyone else out there like me who didn't know.
YES Reg. Cab do have cabin filters.
I crawled under the passenger side dash, removed that chunk of plastic and low and be hold, under a little L bracket, there were 2 cabin filters.
Well, pulled those babies out, and MAN THESE THINGS WERE FILTHY!
I had bugs, and dirt, and all kinds of trash falling out in my floor board.

My speedo has 68K on it. I was supposed to change these things every 15k

Oh well, some new puralator filters installed and she is smelling fresh. Only $18 bucks to change 'em out.

Peace,
Ron