Thule EC3 SwingBlade AeroBlade Load Bar End Caps are the finishing touch for all Thule AeroBlade load bars. The end caps reduce wind noise, and covers sharp edges of bar ends.  Of the four end caps, two are for the left hand side and two are for the right hand side of the bar ends.  End caps are included with all Thule AeroBlade load bars and sold seperately for replacements.