Underdrive Pulleys
 

I was wondering if someone could halp me out. I just bought BBK underdrive pulleys for my 2003 GT and I was wondering if someone could point me in the direction of how I can find out where to get the correct belt that will fit when I change out the pulleys. I used to own and 86GT and I rememeber doing the pulleys in that car and the belt was a few sizes smaller, but I can't remember where I found out the correct belt size. Thanks in advance for any help you can give.

Stock belt will fit just fine. The belt tensioner will tighten it up just fine. You can also buy a goodyear gator back belt, they have a better grip than stock. Don't worry about a shorter belt!

Thank you so much for the help:)