I need to add additional USB ports to some IBM x3650 servers which have PCIe slots. I went through the vmware HCL but did not see anything listed. Will any of the third party cards out there work or ...

Hyper-V is not designed for USB passthrough no matter what you read. Your hardware would be better served with a VMware solution. ESXi on bare metal, or just VMware Workstation on Linux/Windows ...