CNC 6040 Control Box Cables

I have just received my new CNC 6040. But seems the X Y Z cables are a BIT TO SHORT for me going to the control box. Cant seem to move the control boxes anywhere. Has anyone found a supplier for cable extensions, and what type of 4pin connector are they using?

Hi
Connectors are GX16 :
4pin circular connector,cable connector,diameter 16mm-in Connectors from Electrical Equipment & Supplies on Aliexpress.com

Hello

for small quantities of ebay

http://www.ebay.ch/itm/170896881994?...#ht_673wt_1198