This is a brand-new rear brake caliper piston parking brake pin O-ring seal for the following models. 

Yamaha

 

350 Banshee 87-06, 

Warrior 350 87-04 

 all years of the Raptor 125, 250, 350, 660 & 700. 

YFZ450, YFZ450X, YFZ450R ALL YEARS

 This O-Ring is number 23 in the 2nd picture.  

 Free shipping is in the US only. Thanks