For a Stihl 034, 036, 360, 361, 362, 044, 046, 064, 066, MS400, MS440, MS441,  MS460, MS461, MS462, MS500I, MS660, MS661
OEM fit and performance factory Stihl  parts -  make sure this fits, no returns.  
these new parts have been assembled and include 
               1125 007 1021 chain tensioner kit
               1122 664 2200 cover plate
               1125 640 1900 tensioner slide
               1125 664 1400 thrust piece
               1122 664 4500 support
               9646 945 0490 o ring

  
shipped in a box, not an envelope.  From USANot China.  genuine Stihl parts

very well packed and shipped fast, with tracking number.