char82rich80

Hi, i have a 2001 galaxy which i have just bought a set of 7 leather seats from ebay. the front 2 seats have factory monitors which i would like to get working to keep the kids quiet. under the seats the cable seems to be a square pin thingy. i have just ordered a sharan console with double din slot and a pioneer double din dvd player with a video out. now how on earth am i going to connect the 2 monitors to my head unit. what sort of cables or adaptors will i need? I wanted a rough idea rather than going into a car audio shop and getting ripped off. many thanks, rich