Who makes custom aftermarket pulleys
 

I currently have a 2011 hyundai accent gl (nothing model with higher gearing). I am wondering if anyone knows anyone that makes custom pulleys. I want to get a larger water pump pulley to decrease my water pump speed and increase my mpg.

You could pay custom prices, or scour old parts list for a different pulley that meets the spec.

V-belt most likely?

You have shaft diameter and keyway and overall diameter and width.

Its a single v belt. It is held on by 3 small bolts and and a center bore.