Does anyone know where to get one?

I had a rather long night last weekend that ended up with me getting towed home, one of the problems, a minor one, was that the fog lights wouldn't go out. When I looked at it, if I touched the relay they would go out, but I could touch it again and they would turn on (with the fog light switch turned off).

I'm half considering cutting the plug off and wiring a standard Bosch-style relay, but I don't particularly want to change things unnecessarily