Outer Limits 4x4 Board

Hi ppls.

I am trying to find a suitable aux fuel tank for under the back of my van.

The space available is 600 x 500 x 200mm which would give me a extra 60L of diesel.

Im just wondering if there is a aux tank thats close to these dimentions to save me having to get a custom one made.

Im thinking maybe pajero or jackaroo sort of thing maybe????

I figure it would be alot cheaper if I can go and get one from the wreckers.

we used an old beer keg in the bak of a mates l300 once worked well but not sure of legalities on this maybe the aux tank from an 80 series or prado? some one told me that some of the 4 runners/surfs had aux tanks or rear tanks in them maybe one of these?
i used a tank from an mq shorty in my lux worked well but unsure of exact dimentions but pretty flat so it wont hang down to far.
just some thoughts