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You can call your dealer. Even a regular autoparts store can provide the OEM #.
FWIW, I previously came across a link to a webpage that shows the Ford OEM part #'s for different Ranger DPFE's. It seems to indicate that the so-called "newer" plastic DPFE for the 3.0L is really just the same part that they have been using on the 4.0L motor for several years now.
I got my DPFE sensor (the new plastic one) at Advance Auto for $51 and change. I took the OEM part number right off the casing of the old one and brought it to them. Their computer listed the newer plastic unit under the same part number but as the new replacement for the original metal unit.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.