2012 Prius v owner, but I thought to post here about my question as the ECR cooler is a common part, and thought there may be more traffic to the Prius liftback tech section. I am trying to understand the differences between the EGR cooler for the gen 3 (part number 25601-37010) and 2015+ which have a part number of 25601-37020. Anyone know if there are any physical differences between the two, that would result in the newer part not fitting into a 2012? There seem more used parts for less money, for the newer units which also have much less miles. Anyone have any experience with this?