I have a 15t front sprocket and Speedohealer for a 03-06 Kawasaki Z1000. The front sprocket is the same as the one on the 03/04 ZX10 as well. It's a for a 525 chain and has only 400 kms on it. Speedohealer is near new as well with only 400kms on it.
Speedohealer will fit the following "plug and play"
Kawasaki-I plug-n-go kit: Fits ALL Kawasaki motorcycles with electronic speedometer, such as:
Ninja ZX-6R (2004 and earlier), ZX-636R (2004 and earlier), ZX-6RR (2004 and earlier), ZX-6R (2007-), ZZR600, ZX-9R, ZX-10R (2004-2005), ZX-12R, ZX-14, ZZR1400, Z750, Z1000, Ninja 650R, ER-6, W650, KL250, Vulcan Nomad VN1500, VN1600/VZ1600 Mean Streak, etc..
Note: the following Kawasaki models require the Universal harness kit:
Kawasaki ZX-6R (2005-2006), ZX-636R (2005-2006), ZX-6RR (2005-2006), VN900
Speedohealer new is $109 plus shipping and taxes
Sprocket specialties front sprocket $30
Combo pack for $80 bux firm
Pics in the next day or so.