My lower tailgate from Rare Spares is absolute crap.
It fits in ok at the sides, but you can stick your fingers through the gap in the centre on the bottom. Have spoken to another vanner and he had the same issue with his.
Now this is "SUPPOSED" to be the thick one.
Rares told me that "My van must be the problem" rubbish. I've sat another original tailgate on it and there were no drama's with that one.