I don't have a Miele S5211 BRILLIANT LIGHT - S5211 myself, but this one fits perfectly and is listed on the product page. Greetings Dave

Hello Stefficola90, yes, it should almost certainly fit. The pipe diameter is correct anyway and the click system for snapping into place looks identical on the product picture of your 5211. I can recommend the attachment, I'm quicker and it's "cleaner" (including getting fluff and pet hair out of the brush). Have fun with it in the new year!

Unfortunately I can't tell you, I have a different model