so I decided to mod a am3 bracket to am4... : r/pcmasterrace
Barrowch Cpu Cooler For Amd Ryzen Am4/am3+/am3/fm2+ Processor Water Cooling Block ,black,silver,white,red, Fbltfha-04n V2a - Fluid Diy Cooling & Accessories - AliExpress
AM3/AM4 CPU cooler compatibility/modding : r/Amd
Amazon.com: Aimeixin AM4 CPU Heatsink Bracket,Socket Retention Mounting Bracket for Hook-Type Air-Cooled or Partially Water-Cooled Radiators, AMD CPU Fan Bracket Base for AM4 (B350 X370 A320) (Black) : Electronics