Very nice find Chris. you'll have to be careful if you give these your usual shiny paintwork, Your likely to have seagulls trying to mate with their reflection when you use them! (that's the excuse I give for not painting mine + if they don't shine, the pikey's are less likely to spot them.)
These are my discs, part of the 80's wheelhorse 'implement pack': discs; plough and cultivator.
I only have the discs and cultivator, I need to fit my 'stubble' plough unit to the frame, all the different implements fit the same beam, you change over the hitch mounting to angle the plough.