I agree with David and Kevin. If you have a hard time locating a #6, @Omelmad , let me know and I'll hook you up!
I bought the Connaught Omega boar brush with the green handle and I have to say I love it. I've probably used it less than 10 times and yet it is already super soft, softer than any of my other boars. The handle is solid and of much higher quality than Omega's other handles. I have the Pro 49 and the 10066 and the Connaught quickly rose above those to become my favorite boar brush, and quite possibly one of my favorite of all my brushes. Anyone thinking of getting one, it is definitely worth the money and the time it takes to get shipped to the CONUS.