I have a Niehoff crank position sensor (with a number: DR6200) that came off my 1999 4x4 Chevy suburban with a 350 engine. I have been to several auto parts stores and the sensor that they bring up is not the same sensor that I have?

Did you ever think that someone else replaced your factory part with a after market part.Crankshaft Position Sensor
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Duralast/Crankshaft Position Sensor Part Number:
SU1207

  Price:$57.99
Warranty:
2 YR
at autozone. You could also try a dealership.