I bought the conversion kit and the LA shop owner and I tried to install it on the Sixteen. It wouldn't fit. She called the HQ techs and we tried everything they wanted us to try. We spent half a day and they finally said, you can't put that on the 2008 machine. I wanted to be able to use the interchangeable feet but without the conversion kit fitting there's no way to do it. I doubt you could install a conversion kit on the 2007 either. It's great on the newer models.