Several weeks\months late answering this, but here are part numbers:
LeafSpringTensioner on CenterFront JackTimingChain FordMotorCraft# yL2z-6L266-aa
OilPressurizedTensioner on LeftFront CamTimingChain FordMotorCraft# xu2z-6k254-aa
OilPressurizedTensioner on RightRear CamTimingChain FordMotorCraft# xu3z-6k254-ba
Gasket\Seal\Washer for above (2 required) FordMotorCraft# xu2z-6m252-aa
For sellers, Google Image search part# in quotes "xxxx-xxxxx-xx".
Nearest FordDealer\PartsHouse or best prices online if you can wait for delivery.
Be sure they're new Ford OEM parts, not used, not FailureProne Chinese copies.
FYI, the Tensioners have factory production date stamps, an indicator of genuine\new Ford parts.
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More info at
As of this 2020 writing, I'm just dumb lucky, not having had any TimingChain component failure with this 20yr old V6-4.0L~SOHC engine; only issue noticed is momentary rattling during very cold morning starts. The recent removal of the lower Oil Pan & Pump Screen was clean, without any...
2001fordexplorersporttrac.fandom.com
Hope this helps.