hi, i have a audi a6 2.5 TDI SE Auto, the fuel pump in the engine has gone, the p/n is 0470506010, i have found a second hand pump which has a part no 04705060016 its from an audi a6 2.5 TDI advent quatro, i need to know will it fit my car or will it not work as they are slightly different, please help