Another thing. There are two types of dishes. The oval dishes have a large lnb hole. The elliptical dish has two bolt holes with a very small lnb hole in the middle.
If you use the strapping to mount your lnb, it is probably not perfectly centered in the arm because of the small diameter of the hole. The lnb will kind of sit on top of the hole. You'll figure out easily which dish you have when you try to install the lnb. I've used the metal strapping, too, on my elliptical installations.
From your description, you probably have the larger center hole which requires shimming up to use.
This is one reason I prefer the larger oval dish instead. It gets weaker signals because its a larger dish. And the aftermarket lnb installation looks better on the oval dish.
I've heard that the stock Primestar lnb works for fta. You'd just run the H and V output into two different inputs of your 4x1 switch.
You probably won't be able to put the dust cover on because of the shape of add-on lnb's. It looks pretty good regardless!