I have a problem with my golf mk3 headlights help?
 

Basically i purchased some kit lights for my golf mk3, now the fittings perfect BUT the connection at the back is different to my car. i reckon the lights were for, either a newer model or a GTI model. now the lights i bought have a 4 pin long connector, but the wires in my car accepts the four pin but in a square. am just thinking should i sell the lights and purchase new ones maybe suitable ones for my car or is there a converter, that lets me use the lights in my car?if there is please let me know where i can purchase them from

by the way thanx for the time taken reading and answering my enquiry