SOMEWHERE there was a series of photos of the installation of the MK II hammer bushing in the MK III. I have used the "search' plus, looked at a gazillion pages in both the 'rimfire' and 'gunsmithing' sections and cannot find it anywhere.
I put one in my 22/45 when I installed the Volquartsen full accurizing kit. Since I already had taken it apart a couple times, I was familiar and didn't need any extra instructions.....bet you don't either. Of course my kit was ordered for a MKII (on purpose) so it had a MKII hammer.