Florence Knoll mod.180 lampshades  

https://goo.gl/images/tUathR

Does your lamp base with the missing shade look like #1 at the top left?

It looks like a you just have to find the best quality and as close in dimension replacement lampshades as shown.

Do you know how to scale an image? You already have the given dimension, measure the height of your actual lamp base and from that scale the height of the image using that measurement and if you figured that, then you can determine the width of the shade at the top and bottom which will be the diameter of the shade. You can also determine the actual height of the shade from that.

Or you can just eyeball it or wait for someone to give you the actual dimensions you need...that also works.

Just did a quick exercise on proportion...It looks like the height of the marble base is about the same height and about the same diameter at the top of the replacement shade you need.

Yes, that is the one. I have attached a picture of my lamps in my first post.

Indeed I want to best replacement as possible.

I understand what you mean and it is a good idea. It always easier if someone have the actual dimensions, but I think this lamps are very rare.

Thanks you your input and maybe that is the best solution but in the mean time I hope someone can provide me the actual dimensions.