Buell XB9 and XB12 2003-2010 O-ring set for fuel pump ( 2x ) 

This is the Twin Motorcycles replacement O-ring set (OEM P0121.02A8A are obsolete) for all Buell XB models fuel pump.

sold in a set of 2 pieces o-ring

mount with a small amount off rubber lubricant partnumber 526223 

can be found here , or similair product can be used