when i installed my eurolamps on my 190e, i made my own "adapter":
* i left the stock 4-pin connector as is, leaving it connected to the wires
* i created a small "wiring harness", by wiring the 6-pin euro wiring block the proper way (but only used 4 wires because i did not use the euro city lights) on one end, and attaching male connectors on the other end. These male connectors were then connected to the corresponding sockets in the original, still connected 4-hole connector block. I followed the color code of the original wires when creating the harness.