This photo shows the two bolts which pass upwards through the RIB fitting kit under the floor. The bolts have to be inserted this way so they don’t clash with the spare wheel.
The other five bolts are supposed to point downwards and each have a spreader-plate (I rust-proofed them before fitting).
This was the most difficult bolt to fit so I decided to fit this in an upwards position (since it’s inside one of the trailing arm suspension mounts).
I needed a very long articulated socket to get at some of the nuts.