Timing sprocket shaft wear

[derm.1785]

Hi all, after a full strip down and inspection of my early 3.0 sc engine I have noticed that the timing sprocket support shaft has a fair bit of wear on it. I know that I can buy new sprockets with bushes but wondered if there is a replacement for the shaft other than buying a complete new chain box. I’m sure this has been covered in the past but need a straight yes or no and if a yes then who or where I can get new shafts from. I see this as a common wear issue so should be loads of options ( hopefully ) thanks in advance.