So I just checked AutoLite's website, and they only have Copper or single Platinum plugs listed for the 2009 4.0.

The 2.3L has the XP Xtreme and Double Platinum listed as compatible though, would they be the same part number as what fits the 4.0?

The gap, heat range, hex and everything matches when compared to the 4.0 compatible plugs so I would assume I can grab 6 of them without any issues. For reference, Autolite part # XP104 is for the 2.3L XP Xtreme and AP5143 is for the 4.0L Platinum plugs.

I am also looking at the Professional series wires, thoughts?

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2009 Ranger XLT 4.0
4-door extended cab
Air silencer mod - Throttle cable mod