There’s halogen and xenon option. You have to figure that out yourself. If halogen, it’s an H7 bulb, different from H11 fog light bulb. If xenon, I’m pretty sure it’s a D1S bulb. You can can’t swap halogen and xenon. Only the correct one will fit the housing. There’s usually a high voltage warning decal near the headlight if it’s xenon.

This should help - https://www.pelicanparts.com/techarticles/Mercedes-W211/95-BODY-Headlight_Replacement/95-BODY-Headlight_Replacement.htm

Sixto
98 E320s sedan and wagon