2024 - OptiPlex Tower Plus 7020 PSU Upgrade

I just bought a 2024 OptiPlex 7020 Plus Tower (14th Gen Intel 20-Core i7-14700, 64GB DDR5 RAM, 4TB PCIe SSD), for CAD. I wanted a GPU and bought a PNY Nvidia Quadro M4000, which requires a 6-pin power cable. My Optiplex has the 260W PSU (IS 13252 Model: D260EBS), which only has an 8-pin motherboard and two 4-pin CPU connectors.  This is not the older Optiplex ATX case, and the PSU is 2.5 inches wide.  I could not find anything on Dell's website for an upgraded PSU for this computer, but I know they sell the Optiplex with a GPU and additional power. What Power Supply do I buy that has the 8-pin motherboard connector compatible with my OptiPlex 7020 Plus Tower, 2 4-pin CPU connectors, and at least one 6-pin GPU connector?