Got my new lock set off ScottieJ (much appreciated!) and fit the door lock fine with no problems, but I'm having a slight issue with the ignition barrel! I.E. I've got no idea how to change it

The new one has go 2 threaded holes all the way through the barrel, that presumably a couple of bolts go through...
But my old one doesnt have holes right the way through, and where I would assume a bolt goes it has just got a stud type thing that seems to be held tight.
Also you can only see one as the other one is on top of the steering column under the dash

Anyone got any suggestions? lol
