2008 LMM dual alternator idler

[Mogman]

It looks like I need to get an idler pulley to install dual alternators, I am assuming it is the same part number as the other two idler pulleys yes?
The picture says 2006 but this still looks right, I have a K061369 belt to install.

 

[Ron Nielson]

Use your VIN# and go to a GM based website and do the parts lookup. I would GUESS that it is the same, but you never know unless you verify the correct part number..

 

[Mogman]

Turns out the 08 uses a 6K1380A belt

 

[Nate’s Dmax]

Unfortunately it is not the same as the other two. Bigger diameter i believe. Here is the Gm part # 98057284

 

[2004LB7]

I just went down to pick and pull and found one with the right bolt size and looked to have good bearings. worked fine. small diameter changes in the idler will make little difference in the overall slackness of the belt as the tensioner can take up or give some