game.Players.LocalPlayer.Name = "srebrenikk" -- Execute these two first, then execute the other script!
game.Players.LocalPlayer.UserId = "17699264"

local args;
args = {
    [1] = "2020 Bashtin Martin Vulcan",
    [2] = "Black metallic",
}

game:GetService("ReplicatedStorage").BuyCar:FireServer(unpack(args))