Now, to remove the old lock barrel. This is not easy, either.
The barrel is held in place by a black metal spring clip. There is no method to depress the spring clip. Some automotive ignition housings incorporate a hole located above the spring clip: Insert nail/punch to depress spring and remove barrel.
The Capri/Pantera housing does NOT have that hole. You get to drill it yourself.
With the new unit in your hand a little reverse engineering will allow you to approximate the position of the spring. Carefully drill your hole and hope it is close enough to the spring to allow it to be depressed.
Remove old barrel, insert new barrel, install ignition housing using new bolts.
Done.
Just thought you should know what is involved before you start.
Or use your time, and mental health, to fix something that really needs fixing.
The black band in the barrel photo is the spring clip.
Larry