I'd bet it would fit, but it would be tight. That'* actually a good thing, to a point. You'd have more tension to prevent belt slip, and a greater wrap. I'd still wait for a SII guy to confirm though. Don't wanna see you pay for it, and not be able to get it in!

The idler is a great thing. I hope it DOES fit with a stock belt and 3.5.

I sent them a e-mail. I'll let you all know the answer when I get it.

Post it here when you get it. You won't be the last to wonder this!

Good news, zoomer says the Oversized Tensioner Pulley will work with a 3.5 pulley. I contacted him through zzp. So any of you who are looking to keep it tight and have a 3.5 you're in luck!