Hhhmmm...... If the part the store has has two terminals in it, have you tested to see if it will plug in? (don't remember if you tried that yet or not...)

Not a cali emissions truck is it??

 

nope its from georgia and yea was at the auto store for two hours and didnt find one even close... maybe napa has the pigtail for the wt3026 5.9l coolant sensor...

and the pigtail i have now the connections are round where the temp sensor has two flat connections

 

Just for giggles, I would take a trip to the dodge dealer, and have them pull a sensor, and see what it looks like.....