Simply put Ford has both tensioners facing down.
This works as it should on the driver's side. But it puts tension
driven side on the passenger side. This allows for a
variation in intake cam phasing from one side to the other.
This piece simply swaps the piston 180* to tension the slack side.
It will be just the block and you will have to swap your parts onto it.
Here is a link to a write up of how it can be done -
$200 shipped (contiguous