Honda Fit and Jazz (GK5, 2013–2020). The GK5 Fit, a lightweight and surprisingly capable track toy. Explore JRZ’s handbuilt coilovers for the GK5, custom-valved and adjustable up to 3-way double-adjustable for street, track day, and competition use. As the official U.S. JRZ distributor, we help you choose the right kit and valving and get you set up, shipped fast.