I have the FS41Elite J/P. That is 410 mm wide or 16" with a 3-knife Tersa head. Works great, easy to change, cheap to pick up more blades. I was quoted $1200 for a Byrd Shelix head for it a few months ago but decided to pass on it. Mine has done everything I've ever asked of it and I don't see a reason to change anything. Oneida makes a transition from 6" to 120 mm for the dust collection port. If you don's see it on their site, jet them an email about it and they'll whip one up for you.