I've had to replace two of these tanks because the tube on the plastic tank cracked over time due to vibration or whatever. I decided that this time I would see if an Aluminum recovery tank could be used. All the Aluminum fabricators that I talked with said their standard tank was made from 3" OD tubing. With that said, I designed a tank that I was sure would fit in the space on my 78 FJ40. The pictures pretty much speak for themselves.