the 3 circles are the same thing as seen in this photo
not the ones labeled 1, 2, 3 but the rivets that connect them to the board
far out mate ..... well I don't see one of those on your board .... that kinda makes it impossible for anyone to understand what you were talking about !!
you should have shown pic of the broken pot instead
no wonder I got it wrong !
So now that we all know what you are talking about .... the old one should have had a value on it either on the back of it or around the side of the metal casing
there would have also be an A or B indicating if it was a linear or log pot