FOR SALE IS 4 SHIMS TOTAL.  2 SHIMS ARE FOR THE 20OZ SLOT AND 2 SHIMS ARE FOR THE 16.9OZ SLOT.  THE SHIMS ARE USED FOR SMALLER DRINKS SUCH AS REDBULL (IN THE 16.9OZ SLOT) OR 16.9 USED IN THE 20OZ SLOT).  THESE SHIMS WILL WORK IN MODELS GO127/137 AND GO326 AND GO380 MODELS.  THESE SHIMS WILL NOT WORK IN ANY OTHER COMBO MACHINE.  ALL SALES ARE FINAL SO IF YOU ARE NOT SURE IF IT WILL WORK IN YOUR MACHINE PLEASE CONTACT ME FIRST SO I CAN VERIFY IF YOU ARE GETTING THE RIGHT PART FOR YOUR MACHINE.  I LOOK FORWARD TO EARNING YOUR BUSINESS.    REGARDS VENDING COMPANY