Ewen, I know at least three guys in here who had the Whiteline droplinks, some from yourselves, others from ZManAlex, some rusted or corroded badly, in one case they've snapped. Lots of reviews on US forums also don't rate them very well do a quick search here: http://my350z.com/forum
Adrian,
I have never sold the Whiteline drop links.
The only links that I sold were genuine Nissan OEM or PowerGrid adjustables.
Alex.