Hi Bosch spark plug HGR7KQC fits A8 and S8 4.2 and 3.7 to 98, FGR6KQE fits A8 and S8 4.2 and 3.7 98 on. Bosch are the OE supplier so what yoy get from Audi is Bosch with the Audi symbol embossed on the plug. I work for GMF motor factors in South Wales we stock them and they are £3.26 + vat each for the first part number and £5.34 + vat for the second part number.
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