Fitting Vehicle Options: XL,XM,XN(26)(LTG,M3H)(TSB# 23-NA-135 APPLIES TO THIS PART. PER GM SERVICE POLICIES & PROCEDURES, FAILURE TO FOLLOW THE TSB MAY RESULT IN REJECTION OF A WARRANTY CLAIM), XL,XM,XN(26)(LYX,M3U)(TSB# 23-NA-135 APPLIES TO THIS PART. PER GM SERVICE POLICIES & PROCEDURES, FAILURE TO FOLLOW THE TSB MAY RESULT IN REJECTION OF A WARRANTY CLAIM)