yes im going to have to. at the moment i only have 2 cores, dodge does not have a part number for this (dodge dealership cannot order one if it breaks under warranty, lol), and mercedes is on indefinate backorder, there is no stock in the states or in germany (they have to make more). we did put an order in for 5 more to expand the cores we have but im not holding my breath on it so the exchanging of these will be a slow process with us only having 2 extras.