It's a long time since I've had or even closely looked at a Series 1 but from memory they used open contact wire to pcb molex type connectors (
www.molex.com). If someone can post a picture of the required connectors I might be able to find a source for them. Alternatively, solder the wires straight onto the pcb in the lights and that way you won't get the usual bad connections to the lights
If you need to have a quick means of removing the lights then fit an in-line multiplug connector in the wires close to the lights.