O2 sensors and ignition switch
Go to rockauto.com and look up the O2 sensors. Bosch has some that are exact replacements. The sensors are identical for both sides.
For the switch, in the states we can go to a Ford dealer and they will look up the part on their computer. The switches are no longer supported by Ford but but they have access to what all the hundreds of dealers still have in their old stock. They can do a search and possibly find one in somebody's old stock. I got a switch for my 90' model like that.
I think the switch kind of falls apart. You may be able to clamp it together somehow to keep it working. I did that with mine until I got a new one.
Best of luck,
Harold