It looks like your tank may have a "POL" fitting. You could talk to the people at TejasSmokers.Com. They may have a fitting which will allow you to convert your tank to accept the BS regulator (Acme type) or consider this info from their web site:
First "real" post. W00t!
Carlos, if your tank does have a POL fitting (the pic would seem to indicate so), you can get yourself one of these babies
I bought a Blackstone about a month ago and had it ship-freighted to Australia. I've been meaning to document my experience and thank a few people here whose posts have proven to be absolutely priceless advice, but I might as well take this opportunity to contribute and try to help a fellow Blackstoner in the meantime.
Gas bottles in Australia still use the POL valve, and after extensive research (on a topic I knew nothing about) I came across the Grillpro adapter, which helped me fit the (5 PSI) regulator included with the blackstone to a POL bottle.
I hope this helps.