Confused about tensioner pulley

[LVNeptune]

http://www.amazon.com/gp/product/B002YC8BN0/ref=gno_cart_title_1

That has an idler pulley as well as tensioner pulley, correct? A rigid idler pulley?

Only reason I am asking is because the only smooth pulley I see is next to the alternatot.

I have no need to purchase ANOTHER rigid idler pulley correct? That's just for people who want to replace the rigid idler only and continue to use the same tensioner?

 

[Ceejkay]

no the silver in color looking one is what makes the tension, its not a pulley at all. the black one is the pully itself. its one assembly

 

[LVNeptune]

So where exactly is the rigid idler pulley then?

 

[Ceejkay]

its the smooth one next to the alternator

 

[LVNeptune]

That's not rigid though, that's the smooth idler pulley. Both Amazon and Autozone have a rigid pulley listed for this truck. Can't figure it out, no big deal I guess