It is in most cases faster to make your own than to search one and verify it for correctness. As a starting point: Tutorial: How to make a footprint in KiCad 5.1.x?
regarding symbol: If the connector has 80 pins overall then you can use the Conn_02x40 … (choose the pin numbering style that suits your needs) symbol as found in the official lib. If it has 160 pins then you will need to make a symbol for yourself. (Either extend the script to generate one for you or make one by hand or find another generator. kicad-library-utils/schlib/autogen/connector at master · KiCad/kicad-library-utils · GitHub)