Start Story Time:: When I was living in Saudi Arabia most of us had Long Ranger tanks on our Land Cruisers. We usually self installed them because the quality of the local installers was suspect. On the 200 series installation was pretty straight forward since the Long Ranger tank simply replaced the second smaller stock 200 tank (it required relocating the spare tire though).
There was no local seller when I got mine, so we ordered them from Australia. From the time you ordered your Long Ranger tank until it arrived in Kingdom and you were able to clear it through customs, it was typically more than a six month period (later a local ARB store started carrying them).
On the 70 series the Long Ranger tank was a complete replacement for the stock Toyota tank. It required some metal cuts to get it out and make way for the new larger Long Ranger tank. As a result, once you started removing the stock tank, you were committed. You couldn't change your mind and reinstall the original tank without some metal fab and welding.
We were helping a friend of mine (Tom) install his on his petrol 70 series, and right after we removed the original tank, while Tom wasn't looking, we substituted the cardboard box that his 70 series
petrol Long Ranger tank had shipped in, with the box from my previous install (a 200 series
diesel tank). I then said, "Hey Tom, isn't your engine a gasoline engine?" Tom turned white, came and looked at the box where it clearly said it was for the diesel engine only. We all knew the two versions were not interchangeable.
We made him suffer for about five minutes, with his LC70 up on the lift, while he yelled and cussed about the fact that he wouldn't be able to drive his LC until the petrol version arrived and he'd have to pay import and shipping costs again. When we finally broke the news to him that we were joking and he had in fact ordered the correct version of tank, he punched me in the arm. That started a long sequence of practical jokes between us (we are still good friends even though we live in different parts of the US now).
That punched arm made the rest of the installation a literal pain since you spend so much of the installation process with your hands above your head. It was worth it though
End Story Time.