Precision 7550 GPU upgrade - need heatsink model

​I am upgrading a Dell Precision 7550 mobile workstation from integrated graphics to the Nvidia Quadro RTX 3000 6Gb GPU (model # NI9E-Q1-KA-A1 464HC). I ordered what I thought was the correct heatsink/fan upgrade (model # 1NTTD) but it was not the correct part. I can't seem to find confirmation on what the correct gpu/cpu heatsink/fan assembly I will need for this upgrade. ​

​Can anyone point me in the right direction?​

​I also ordered the GPU power cable (model # 8Y80G). Are there any additional upgraded components I have missed?​

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