I am fairly certain that it won't fit on a cab model, but I'm 100% sure it won't fit on an open air "isolated platform" model. It states it somewhere on deere's website.
I don't see any problem installing a 49 hoe on the 5520 cab tractor. There is a different power beyond kit listed for the cab and ioos platform. These models require the LVB25185 instead of the LVB25367 for the oos tractors.