Precision T5820 Quadro SLi

According to the NVIDIA site and Dell documentation the 5820 is certified for SLi with the Quadro P5000 but Dell will not provide me with such a configuration. I'm in Australia

I can't even buy a Quadro SLi HB connector from Dell.  The Asia Pacific spare parts people only seem to have the earlier non HB versions.  Can anyone help or know the situation?