Override kernel version

5 
  boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_4_19.override {
    argsOverride = rec {
      src = pkgs.fetchurl {
            url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
            sha256 = "0ibayrvrnw2lw7si78vdqnr20mm1d3z0g6a0ykndvgn5vdax5x9a";
      };
      version = "4.19.60";
      modDirVersion = "4.19.60";
      };
  });

For anyone looking the above finally worked for me, thank you for the help: )

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