I have a Directv AU9 none SWM LNB and would like to upgrade it. I was looking at just replacing the basic slimeline LNB with SL5s4r2-02 SWM LNB. Should this Swim LNB slide into the LNB FEED ARM with no problem or have I purchased the wrong LNB. I want to set my home up on DECA technology latter on after the upgrade. any input on this would be greatly appreciated!