IMS Retrofit O-Ring kit including the IMS Flange Seal (part number 99610511201), 3 new micro-encapsulated flange bolts (part number 90038527501) and the 10 x 1,5 o-ring for the flange muzzle ID on the LN IMS Retrofit 106-08.2, 106-08.2.2, 106-08.4. Does not fit 06-08 models.