Ok, I'm looking to do the cheap 16 tooth front sprocket upgrade. I visited solomotoparts.com and they have the AFAM 520 Front sprocket for $34.00 and listed under O.E.M. parts for an 04/05 ZX-10R. Now I thought the chain was a 525 for the 04/05 10R...did they just make a mistake (there's no way it will fit right?)? Also, are they no longer a site sponsor because I tried to do the free shipping coupon code and it says its no longer valid. Thanks.