Installation Kit For the 3D603, 3D604, XS 306, XS 307, XS 308, and 308, XS 308. Supplied with metal ring (position 1) and screws (position 2). The plastic ring (position 3) is part of the supplied tankrussak. Tank socket for: Kawasaki ER-6N (09-10) Kawasaki ZX-6