Vortech V1 Idler Pulley Newedge

Can you fit an 8-rib Mustang idler pulley in there somehow? Is this one that is spring loaded or is it a fixed bare pulley?

If it's a fixed bare pulley, you can put pretty much whatever you want in there. 8-Rib, 6-Rib, it doesn't really matter. All it's doing is taking up belt length. The diameter isn't really that important either. You might need to get a longer/shorter belt to accommodate the pulley.

I tried Googling "Vortech 4FL116-150" and it showed a bunch of different idler pulleys for a lot less money. Of course they're not all the same diameter though. I guess one way to go about it is search on industrial suppliers sites for idler pulleys and find one that would work? Try this for example:

www.grainger.com/category/fleet-vehicle-maintenance/vehicle-engine-radiator-exhaust-maintenance/vehicle-engine-maintenance/vehicle-belt-idler-pulleys?filters=webParentSkuKey&webParentSkuKey=WP15568094

I don't know how the belt system works on the Vortech, but if it's anything like an ordinary serpentine system with a tensioner I think you could probably just use a pulley that's "close enough" and make it work. For example, I'd go with the 2-3/4" pulley since it's only about .125" (1/8") larger in diameter.