I want to fit a new rear floor (flatbed) to my hijet

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Hi everyone,
My name is Sherlock and this is my first post! Hope someone out there can help me.
I have a S81 Hijet truck with a rusty flatbed that needs replacing.
Want I want to know is, can I fit a flatbed off a S110, S200 to a S81? Are the fixing points and bolt holes the same on all or most of the models?
I know there will be the rear lamp problem etc, but I can get a complete rear flatbed with tailgate, sides, lamps etc.. and it's pretty cheap!