Belt size help

I know This has probably been asked many times but I'm putting a 2.9 whipple on my cobra.. the car has the 4 piece idler pulley kit and the aux idler. I have a whipple 3.0 upper pulley and stock lower. What size gates green belt do I need?

Try going to billet flows web site they have a belt guide there

Anyone else ?

That didn't help

Looks like the k080755 but must use the 92mm idler