This is probably old hat to everyone here, but i've taken so much i feel the need to give some back! After trying unsuccessfully to find a good used switch, or new Volvo replacement for my badly corroded hi-low beam switch, i got an aftermarket Chrysler unit at Canadian Tire. (Cost me $8.89 in Canadian Tire Money) I used a round file to open up the mounting holes a bit, as they were wider apart than on the original. I crimped female connectors to the ends of the wires, since the new unit has blade type terminals. I joined the red wires on one terminal with an adaptor. Red wires went to the inside terminal, yellow to the centre, and grey to the outside. I used heat shrink tubing to seal the connections. Only took a few minutes and works fine. Given the condition of all the switches I saw at the wreckers, this seems to be a common problem.