Those, and the type 9007, are notorious for having badly designed connectors which sometimes melt down even with standard wattage bulbs if the connecting metal parts get the least bit corroded. saabnet.com is full of great weeping and gnashing of teeth from people who switched even to 70/80 watt bulbs on classic 900 cars with USA headlamps, although I have used them for years on Ford products with no problems as long as I kept the contacts clean with TV control cleaner spray and dialectic grease to keep the crud out. It's far better, though, to switch to euro light units which take H-4 bulbs and appropriate connectors.