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If you are buying the complete tensioner set, you need nothing else...although it would be a good time to replace the belt as well.
The most common noise issue wth the tensioner is the shock bushing, not the pulley. When the bushing wears out, the shock starts banging around its mount, most prevalent as a knocking sound at idle.
And while you are in there, check your fan clutch. Much easier to replace if you got stuff out to do the tensioner...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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