Re-use the MOPAR in the existing OPDA unless there's a specific reason you need to replace it. As for never-seeze - I personally put it on the coil rail bolts, but that's just me. A career in a marine related field has that ingrained, rightly or wrongly. YMMV and all that...ODPA going in, cant find a mopar sensor (discontinued), so its gonna be a Echlin.