Custom length base to black box cable?

[bolek]

I would like to make a custom length cable from the GFII or GFIII base to the black box. What are the exact specs for the connector? As far as i can tell from googling images it looks like GX12 or GX16 4-pin female connector on both ends? Is that correct? if so then which size? I don't have one yet so I can't measure :confused:

 

Also, it would be good to know the specs of the cable. Is there anything written on it?

 

Thanks!

 

Bolek