Thanks, TxBill. My headlights are US. I just replaced them with the ones that were in there. I assume they are the ones that should be in there (due to my lack of effort, I haven't checked the specs on my w126 CD). I know they aren't the original ones cuz my mechanic had replaced them and due to them getting fried right away, he was able to ascertain that the voltage regulator was overcharging the system and consequently burning out bulbs quickly.
84 500sel EURO 87K