Ok. I got out to the car and took some pictures (you should vow to do better at dressing/organizing your wires!). I don't know the actual names of everything and couldn't find them all in the parts manual but hopefully, you can catch my drift.
The hole you mentioned is, as you can see, found in my wheel too. In spite of the number of times I've had my wheel off, I never really noticed it!
The first picture is as it looks sitting in the driver's seat. (wheel.jpg)
The next picture is without the "cover." (wheel without cover.jpg)
Next are two pictures of the cover (cover.jpg and back of cover.jpg)
Next is the wheel without what I call the "dressing", nut, and washer (wheel without dressing, nut, and washer.jpg)
(The nut is 1 1/16" hex)
Next is the "dressing", the nut and washer (dressing with nut and washer.jpg)
Next is with the wheel off but the turn signal canceling "collar" and the upholstered escutcheon (no wheel.jpg)
Then with the escutcheon taken off exposing the stalks assembly. (no escutcheon.jpg)
(Now's a good time to mention that the stalk assembly is comprised of the left hand stalk which controls turn signals, horn and bright/dim headlights. The right one controls the windshield wiper and washer. Those are Spitfire parts. What is not a Spitfire part is the plate that is front and center in the picture that the two stalk controls are screwed onto. That is Europa specific. If either of your stalks is busted, you can replace them with the Spitfire part but you must be careful when you take the switches off the plate and watch carefully where the loose pieces go. There are spring loaded contacts in the stalk switch assemblies as well as a rolling contact (IIRC, for the turn signals) that touches contacts on the plate (again this is from memory).
Then a shot of underneath the steering column showing the impact clamp (underneath.jpg)
(You can see a brace anchored by two small bolts and nuts going through the floor of the front trunk. This attaches to the steering column bracket I believe. That is not absolutely necessary but if you don't have it, you should consider making one. It's just a piece of flat stock with small bends and hols in it. The parts manual gives you a pretty good idea of what it looks like. Also, the front part of the inner steering shaft is seen going between the clutch and brake pedals. Loosening up the impact clamp allows you to shorten the steering column so you can disconnect it from the steering rack.)
And lastly a shot of the bracket that holds the steering column to the bottom of the dash (bracket.jpg)
I hope this was helpful. I've probably told you much more than you need to know. It's not that complicated but if you have any questions, don't hesitate to ask.
Good luck!