I'm guessing you translated this from another language and mean "fan" instead of "radiator". AMD doesn't sell fans, and the HD 7000 series is long out of production so the only place to find them would be eBay.
Contact the company that made your card. AMD did not make your card, just the GPU used on the card. Someone such as ASUS or XFX etc made the card. If there is a direct replacement part, they would be the ones that have it or could point you to an equivalent. From there as black_zion already mentioned ebay may be your only hope. There are also aftermarket complete replacements out there, but likely not worth the cost on such an old card.
arctic.ac is a vendor of aftermarket coolers that may be what the OP needs
i use one of their 3 fan coolers on my old HD 6970 and it has done an amazing job with that power pig