Steve, The factory mounts are made from some sort of mystery wood, and smaller than most other builds, yes, definitely add the pads. The Fox is not as smooth as other engines, which makes this more important. Because the mounts are smaller, don't inlay the pads, just add them on top of the beams. This will cause some mis-alignment with the cowl but still will work. I don't think that you can get a 4" bellcrank in without major work, but definitely replace the existing 3" one with one that is bushed and with new leadouts (use the existing ones to pull the new ones in through the wing to the bellcrank). Also add ball links at all connection points. The stock metal connectors don't fit very well and get terribly loose very quickly from vibration. All the above has been learned the hard way. There is lots of info about this plane and easy improvements that will extend it's lifespan in the "ARF" section. Good luck.