(Coming off another post I made about changing the clutch release bearing on my xr3i 89 escort MFI)

I took off the gearbox today to change the clutch release bearing and I seem to have found why it's been failing and making a noise. It isn't really connected as it should be, or so I think.
When reading the haynes manual it says this...


But when I had the box infront of me I could just pull the bearing off and there was no retaining nut to take off or any retaining part attached to the bearing itself.
Also the pin that the haynes manual talks about seems to be snapped off as in the photos below





So I thought a previous owner had replaced the bearing at some point and just not put this bolt on retaining part back in place for some reason and the only thing holding it was the pin on the top and that's why it's snapped under pressure but now when I have been googling images of a mk4 escort gearbox it seems none of the gearboxes have this MYSTERY MISSING PART!

So what the hell is it talking about?
And also where can I get a new retaining pin?
Anyone?
Please!!