Dexta temp sensor bulb nut size

I'm trying to add a tank style heater to my Dexta diesel. The threaded opening into the block (where the temp sensor resides) appears to be 5/16" (3/8" nipple is too large, 1/4" nipple is too small). I can't seem to find any fittings locally or at McMaster-Carr or Grainger. Are there any other options? Am I wrong on the size? Thanks for any help.
Marlin
 

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