Ok so apparently there is no such belt as the k060737. I went to 6 diff auto part stores including pep boy, 2 autozones, and napa and that belt isn't in any of their database. It goes from 735 to 739. So after trying the 735 and it failing due to it being to short I went with the 739 and it went on just fine and my car is running great now with absolutely no squeaking. So for anyone with an 07 sciont tc that plans to install the nst pulley set the right belt size is K060739.

With that out the way. I love the pulleys. Def noticed a big difference in power and throttle response. I also have the speed source mounts install and the combination of both are amazing. Def recommend the pulleys and mounts.