That looks like the correct tensioner. I recently replaced mine... There is another write up for the job on here. It looks slightly different due to a beefier spring the housing is larger. I noticed an improvement with my power steering after replacing mine.
Thanks @Yuman Desert Rat! @hoser verified I had the right part, so we put it in and it's working just fine.
Funny - I noticed the same improvement in the power steering of my rig too.