Network Lobby Manager Spawn Selected Prefab for Client

Hi, I want make each client can select their player prefab in lobby and when game start i want instantiate selected prefab for client.I define varible in LobbyManager but its not working.Its always same with host.How can i make this ?

  public override GameObject OnLobbyServerCreateGamePlayer(NetworkConnection conn, short playerControllerId)
         {
             Debug.LogError(playerPrefabIndex + "Ins Index");
             GameObject playerPrefab = (GameObject)Instantiate(spawnPrefabs[playerPrefabIndex]);
             NetworkServer.Spawn(playerPrefab);
             return playerPrefab;
         }