It shouldn't of changed it mate unless you are running a different type of sump??? If you are you will have to ask the dealer you got the sump from because the measurements shouldn't be that far out. The only difference in pulleys are between the 4x4 late spec, and the older/2wd ones. However there is no difference in size, just on what pulley system they run. (Late spec 4x4s run single aux belt, and others are twin belt systems).