I need to replace the LNB on my old SL5 dish. It is curently held in place on the arm with two 8-32, 1-3/8 bolts that go through the arm and the base of the LNB. I'm noticing that newer SL5 dishes seem to use a lever actuated compression clamp to secure the LNB (which looks like a better idea...however I digress). Are the commercially available SL5 replacement LNBs "universal"? That is, will they fit either type of feed arm design or is it possible to get the wrong SL5 LNB for the feed arm on my dish?