@Snakelimit
All done. It was a bit of a fornicator as two of the holes emerge inside the tailgate behind reinforcers, but taping nuts to the end of spanners and gingerly inserting them while twiddling the bolt from above (and a s***pot full of swearing) got me there in the end.

Put a smear of Sikaflex 221 under the top 'clamp' and behind the lower flange. This stops shifting and creaking, and prevents water ingress via bolt holes.
I'll let the Sika cure for 48hrs then mount the spare. Mine is on 18s and the spare is still a 16, so when I get back from next week's camping trip I'll source a bigger tyre with a deeper sidewall to match the outer diameter of the road wheels/tyres
All done. It was a bit of a fornicator as two of the holes emerge inside the tailgate behind reinforcers, but taping nuts to the end of spanners and gingerly inserting them while twiddling the bolt from above (and a s***pot full of swearing) got me there in the end.

Put a smear of Sikaflex 221 under the top 'clamp' and behind the lower flange. This stops shifting and creaking, and prevents water ingress via bolt holes.
I'll let the Sika cure for 48hrs then mount the spare. Mine is on 18s and the spare is still a 16, so when I get back from next week's camping trip I'll source a bigger tyre with a deeper sidewall to match the outer diameter of the road wheels/tyres