Well here is the down low.
First off the part number for the gates belt is k061247. This is not a part random shops can order or stock, if your local shop has it consider them lucky. I asked the guy at the Napa & Kragen's stocking warehouse about current stock and they couldn't put through an order but listed the item and they don't stock it. They can't special order it either.
After talking to Whipple it is proprietary belt and only Gates will sell it to them. I have a feeling a few other big performance shops will have it if they do a big whipple install business.
With that said I called a few websites that did list this product on their site, mostly shops in Detroit (go figure) and they all said they need to remove that off their site because they don't have it and can't special order it.
I did find a company called racemart who has the belts for 25 bucks each vs whipples 89 bucks. They said they have them in stock so I picked up a few. I'll report back once I get them, a few reviews on the web were a little bit shaky at best.
Link here link to web store
Reason why my belt failed or ripped one rib.
I found out after a conversation on the phone with Michael at whipple that due to fords tolerances on building motors some setups require a spacer behind the blower pulley, around 3mm. Not seeing a mention of this in my instructions or maybe I stopped reading them, I was like a deer blind in the headlights. Truck ran fine for a week till the belt tor off a rib.
After also chatting with Whipple and JDM about my Valvebody in my truck, I've decided to upgrade to the Roush tensionor that FatherFord posted not to long ago. I have a feeling the truck shifts so hard that it could possibly be bending the funny stock tensioner from the shock of the shift, similar to a manual trans car with a puck style clutch.
Another key post I picked up from mustang forum is a reply from Dustin at whipple.
"What they need to do is open the tensioner to max position with a breaker bar. With a sharpie, draw a line across the rotating arm and the base. This shows the max position open.
Then install the belt, put at max open on tensioner. Start motor, let idle a few minutes, then rack the throttle 4-5 times. You can also watch the belt during this time, to see if its tracking properly, if something else is bent, then it won’t track true.
Now that the belt is hot, it will stretch .5-1”. They should be able to see the tensioner has now moved in its position, so they’ll need to slide the idler down more, and get the tensioner back to the max position. After running 50-100 miles, they should check again to verify it has not moved, if it has, then it needs to be re-adjusted."
I hope this helps anyone else in this position. Btw I'm loving this whipple setup minus this little hiccup!