Hi, I'm new to this forum and I just bought a '74 450sl. I've got a lot of questions about this car as it is my first mercedes. I noticed that 74 and 75 seem to be the only years with square headlights.I actually like the quad round ones better.Is there a way to switch to the round ones? Is there a more modern fuel injection system avaible for this car? Is a weber or holley conversion possible? What are the fluid requirements? Is there a good tow package out there,because I'd like to be able to tow my bike behind it. Any help is appreciated. Thanks,Doug.