What is the rebuild kit for the Bostitch SX1838K stapler? Support October 03, 2020 18:15 The rebuild kit model number for the SX1838K is BT55/SX38-RK. Please click here to purchase this item at our Bostitch ServiceNet website. Related articles My Bostitch pneumatic nailer/stapler is leaking air from the exhaust area. What are the most common causes? Comments 0 comments Please sign in to leave a comment.