What belt with 2.81+100mm idler

[Black_Sunshine]

Sup fellas. I am getting my Steeda 2.81 pulley and the Steeda 100mm idler that sits right next to the blower. I did a search and found many different opinions on the belt size. Just wanted to a few last thought before I buy it.

So, I am going to go with a Gatorback. Should I hit up the 74" or the 74.5"?

Thanks...B_S