Hi,
just spotted your thread. Thanks for your comments, I have owned my white supra for one & half years, and still can not find out what the bloody make of my splitter is. Luckily it was on the car when I bought it, and even if I do say my self, it is one of the better splitters out there. I, like you, wish to find out what it is, incase I need to replace it at some time , due to damage. AS the previous guy said, the whifbitz is the closest to it but is not the same, as mine is fairly flat in the middle and not dished.
I will keep searching and If I find out something I will let you know mate!
There is a couple of other views in my garage if you have not already seen them