For the sake of discussion (and my own personal interest since I have one, that isn't installed yet) the tank was for either diesel or petrol and is still in production so far as I can tell. Its just that from the US website you can't 'see' it as they seem to be showing us what we're allowed to have, not what we want to have. Here's the link to the SA site but it may still redirect and force you to change the desired location:
https://www.frontrunneroutfitters.c...el-tank-land-rover-discovery-lr3-lr4.html#tab
In the product questions the petrol vs diesel question is asked.
While I didn't install mine in the UAE it is enroute to the US, I hit a point there where I didn't want to be dealing with any potential troubleshooting or codes popping when I knew she'd be inspected for export (and given that I hard to argue with the tech about her not being 'green' as the color of the truck b/c of the hood blackout I think that was the right call). Unclear, indeed unlikely, it will be a direct bolt on install but that's ok-the extra 80L will be worth it if I can sort it!
r-
Ray