How to remove VZ wagon rear bumper???

[asht12341234]

I'm trying to take the rear bumper off my VZ wagon and i can't seem to work out whats holding the sides on? i undone all the plastic screws around the at the back and the screws where the mud flaps would. is there some nuts on the inside i have missed??

 

[Benboy]

I have included some Workshop Manual pages on the subject. They may contain info that you have not considered. Good luck.