Where to find the video card for the precision 6600m workstation LT

Hello Dell friends
. I have a Dell Precision 6600 M workstation with win 10 os and AMD FirePro M8900 2 Gb video card that no longer works after 2 years of use. Does anyone know where I can buy the same VC or a replacement (Graphics: • AMD FirePro M8900 Mobility Pro with 2GB GDDR5 dedicated memory
• NVIDIA Quadro 3000M with 2GB GDDR5 dedicated memory
• NVIDIA Quadro 4000M with 2GB GDDR5 dedicated memory
• NVIDIA Quadro 5010M with 4GB GDDR5 dedicated memory). Thank you very much.