I searched through the hundreds of photos taken of my 230SL since getting her in 2011, and I was amazed and disappointed that I didn't have a single shot that showed that body and paint number plate on the left front fender, just inside the hood. So today we visited the car at the body shop and took the picture. The ...980 on the lower right is a number that we've seen on the hardtop and I think it's on the data card, too. And by golly, there's a ....66 there, too! I presume this just means the doors are the correct ones that were on the car when it left the factory, so the important part of my question is resolved. I sort of wonder why it's 166 on the doors when it's just ...066 on the little plate, but unless someone has an interesting explanation, I'm not going to worry about that.
Thanks Jonny for telling me what I needed to do. This basic information is of course in the Technical Manual, under Data Card