I feel your pain OP. The first one I bought through Walmart which showed the push rod installed on their website, but when I got it, lo and behold, no push rod.
I promptly returned it. I then found
this one sold by Power Brake Exchange through Autozone, which also showed the push rod installed. I called Autozone
to confirm, and they said yes, it comes with the push rod. Don't think Autozone sells anything from PBE anymore, but you can contact them directly.
Looks like they're all out of the early model one, but the later model one they have in stock.
http://www.pwrbrake.com/inventory/296-hydroboost-units-71735-hydroboost-unit
EDIT: One thing I didn't like about the part house remans is that they paint the whole thing black, including the cylinder.
The one from PBE comes unpainted and you paint it the color of your choice. I painted mine black, but not the cylnder
