Welcome to the madhouse
The spare wheel carrier is just a cable, under the rear of the car, with a rectangular piece of metal that fits through the centre hole of the wheel (you can see the recess where the wheel fits). It's wound up and down using the long bar clipped into the roof of the little compartment in the step inside the sliding door. The bar fits through a hole, that can be seen when the tailgate is open, about 6 inches to the right of centre and just below the floor level.
If you've still got the original skinny spare, scrap it now - the tyres/valves have usually perished with age
