The aid kit in my '82 300D Turbo is the original one, and it looks like it didn't see much use. In fact the Asprin has an expiry date of something like August 1982! I should really replace that.
My dad told me that in Europe all cars are required by law to have the first aid kit, emergency triangle, and a fire extinguisher. I wish my Benz had the triangle, but like most North American models it doesn't. I asked my dad to buy me one when he was in Europe last summer, but he could only find metal ones that where too heavy as it would have taken a large chunk of the allowed baggage weight limit.