x3 there is a pretty good chance the lower ones are there. However it seems there are more and more stories that people put together top ends with out the piston thrust washers. http://www.ebay.com/itm/LT500-LT250-Billet-Thrust-Washers-Bearing-Kit-Quadzilla-Quadracer-/300985238795?pt=Motorcycles_Parts_Accessories&hash=item46141e450b&vxp=mtr

Theres the kit you will want for the billet thrust washers for the piston.

That's ERBE, they are the same kit if you buy it here in the store.