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Try Graingers, McMaster Carr, or Fastenal. One of them should have what you're looking for.
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Don't forget to look into "Enco", they carry a lot of machinist's supplies.
Ralph
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I made threaded inserts for a friends milling machine that would be similar to what you need for your DP.Measure the width and depth of the slot.Buy a short length of the correct width bar steel and cut to length.Probably 1" or so. Drill and tap for a bolt or better yet threaded rod.After the insert is tapped,Peen the bottom threads with a punch to prevent the rod from turning in deeper than the insert.
mike