These bearings are taper roller style bearings. Kawasaki ZX-6R (ZX636 D) (2006). Kawasaki ZX-6RR (ZX600 K) (2003). Kawasaki ZX-6R (ZX636 B) (2003-2004). Kawasaki ZX-6R (ZX636 C) (2005-2006). Kawasaki ZX-6R (ZX600 P) (2007-2008).
The Headstock Steering Bearings & Seals for Kawasaki ZX-6R and ZX-6RR models would be best suited in a motorcycle repair or replacement store.