Thank you myhondas that will be magic....
What happened was this; bought a cb750k2 basket case but all there and totally original/untouched..even though a lot was unusable it gave many new insights into originality issues that folk have argued with endlessly!! (Especially Candy custom gold on tank!) When I bought it , it did not have a key for the steering lock, but I had a spare lock that I thought was OK, when I had sprayed the triple tree lower, and went to get the spare lock, it turned out not OK.....
So, I tried every key I had in both with no luck...
Getting the original lock out of the K2 was a nightmare, I had to whack it with a hammer carefully tap it out losing my temper often using lots of lube and patience ....
I am OK for Ignition and seat catch thanks these work fine....