This gets a little complicated...involves USA encryption export restrictions, and import restrictions for other countries. The SRX hardware is itself in the restricted class, and therefore the only Junos image available is the (poorly named) domestic or USA/Canada version.
But...that doesn't mean you can't get it. Please contact our customer care team (or have your reseller do so) and they should be able to get you access or explain what you'll need to get it.
HTH,
-Keith