My friend had purchased a C350 a year or so ago. he never did get the fs 601 finisher to staple(or so he says)<BR>He recently purchased a C450 and that one had a FS 601. My first thoughts were they should not be the same finisher so i looked them up and sure enough the C450 does not use the FS 601 yet&nbsp; his machine has one and it works. Are they backwards compatible. The reason i ask is i have a customer that is getting a C450 but does not need the FS603 or whatever will come with it. I have another customer that messed up his finisher and paper transport in the move. Can i assume the finisher will work? Can i at least assume that it has the same mechanical parts and i can rebuild his finisher with the gears from the new one?<BR>Confused