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This would have to be an early model. Do you know if this is an all electric version or is it a hydraulic model? I don't recall any of these early models having any slide locks. At least not built in. Some did come with manual units that you installed on the sides or the top and then removed before you wanted to put the room out. Get back to me with this information and I can assist you further, once we ascertain who made the hardware. All follow ups are included in our fee and fully expected.