I've moved your question to a new thread, as its not nice to go off topic with someone else's help request.
You can have 13 and 16 on a single fixed dish, but only using thin style lnb's such as Alps. You also need a dish larger than 80cm, but 1 meter or above is better. You may also need to make your own lnb bracket as standard lnb holders will often be too big to get so close.