Hi, sorry, I know the vast amount of parts are compatible, I meant parts which are specific to the SRT6, the water pump I required, the thermostat, alternator, serpentine belt, these parts are what Ebay sellers believe to be the same as the N/A version which are not and are difficult to acquire, all where supplied incorrectly even after telling them the belt and pulleys where 8 ribbed, even giving them the Mercedes number they still provide the wrong part and insist its correct, blaming their suppliers for the wrong cross reference eventually. We have no Chrysler dealers that's why for specific parts it has to be Mercedes though they are reluctant to be associated with the cars, yeah, N/A parts can be plentifully but unfortunately the parts I've required recently have all been SRT specific. The site I linked is quite good for parts in the UK though they have no alternators or water pumps either and don't supply some parts which are SRT specific.