What physical size are they? You should be able to tell what series they are by carefully measuring the pin pitch, etc.
Are they the same size as a PC ATX style power supply? I would think they would be much larger since that style is only good for about 5A per contact. I am assuming your application would need 15 or 20A capability on each contact of the connector.
Perhaps they are something like the VL series, which are 6.2mm pitch and rated for 20A per contact?
http://www.jst-mfg.com/product/pdf/eng/eVL1.pdf