If this is the right kit for your sled, I dout you would have to "notch" the track to make it fit. I would be leery of this item.Is it possible to stretch an f7? I am looking at an ext kit that I found on Craigslist, but some things don't quite add up. The extenders don't look very strong, and I am told that he had to "notch" the track to get it to fit. Any thoughts?