Kwikee 379606 Control Unit For Pre-IMGL/9510 Step Control With 5323 And 5327 Switches For pre-IMGL/9510 Step Control with 5323 and 5327 switches Designed to be used with the magnetic door switches (normally closed) The control unit is designed to be replaced on the pre-IMGL step units that were manufactured from 1999 to 2005