Lippert Kwikee 379648 Step LINKAGE KIT B, PRE-IMGL/9510 CONTROL STEPS WITH 909504000 MOTORS, CAST The Kwikee Electric Step "B" Linkage Repair Kit is designed for series 28, 29, 31 and 39 Kwikee electric steps. The kit comes complete with everything but the step and step frame Both a magnetic 3/8" core round door sensor and magnetic small rectangular door sensor to fit all applications Includes "B" linkage and gear box Note: This is Kwikee Part Number 909533000 Made in the USA