Just an FYI, S1 manufactured (2 pot pistion calipers) from 04-06,
07-09 is S2- four pot pistons
Now in some countries, when the bike is sold, say manufactured by Yamaha in 04 but sold in 09, its considered a 2009... Just make sure the calipers, are two pistons, like yours..
It'll have the bracket that bolts to the fork, the S2, NO bracket..