You can use the Round scaller Ring if the present can be removed to fit the lnb properly,So always take care one thing ,while catching a satellite it is good Idea to hunt with single pol lnb and add one high gain signal TP and fix the lnb Vertical or Horizontal and then start Tuning your dish + lnb.
Now the ROD is ok I think but as I said above you must take care of its focal length means the lnb should be properly adjusted and also look towards center of the dish, Not right or left other wise you will get weak signal ok.