There are no ways to attach filters of any kind (except for Lee's special type) to Nikon 14-24G lens. The lens comes with built-in/non-removable hood with deep cut-outs and no threaded filter ring. I know Lee has a specially made (and very expensive) bracket for this lens either announced or available.

With my 24-70 Nikon f/2.8, standard P style bracket causes vignetting below 28mm or so. I know Cokin makes wide lens bracket (has only one slot for filter so it's thinner) but I do not have one. You are probably pushing it too far with 17mm....