we are doing an n7 right now, besure to look at the distribution augers real close, i didn;t think ours were wore to bad till i laid a new one down beside it, also while your in ther look at all the rubber seals, it is easier to do them now than later, also there are some wear strips on both side of acc..roll lugs, they are bolted in an easy to replace and probably wore mor than you think, this also agood time to replace the acc roll lugs, if the little 3ft auger trough has not been replaced it would be wise to look at it also.. i'll let you know if we find any thing else