I have a plow like yours, mostly, a three bottom main beam with a bolt-on extension to make it a four bottom.   Bought it used thirty years ago, just got an owner's manual and parts catalog this week from the museum along with build cards for my tractors.  Has a 565 decal on the main beam but the small model # decal on the front is unreadable.  The owner's manual the museum sent says for White 560, 565, and 566 plows.  The features are the same as my plow, but they don't show my particular configuration,  three bottom beam with bolt-on extension.  They show three bottoms  as a four bottom beam with one empty space.  Mr Schwiebert, do you know if this was an intermediate or previous model?  I don't think it makes any difference as far as set up goes, just curious.     A funny thing about the parts catalog, nowhere does it list plowshares, (around here we always called'em plow points ), the part most replaced on plows  and they're not in the parts catalog? Seems strange.