CTS-V was factory supercharged. Here's a page from the "belt drive" section of the Rock Auto website for the 2006 CTS-V 6.0 engine.
As with other belt tensioner assemblies, it appears that your pulley is replaceable separately from the tensioner itself. Open that ^^^ link, use the red X to close the page, and look at the "tensioner pulley" listings.
2006 CADILLAC CTS 6.0L V8 Belt Tensioner | RockAuto
RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.
www.rockauto.com
As with other belt tensioner assemblies, it appears that your pulley is replaceable separately from the tensioner itself. Open that ^^^ link, use the red X to close the page, and look at the "tensioner pulley" listings.
