Same question I have been pondering - better still, two tanks, one modified to go the other side at the rear so you have one filler on each rear wing.
I am getting my kit delivered soon so will investigate further, but in the meantime I did buy a Spitfire tank off ebay and will mount this at the rear of the Spring across the boot supports, as I think Gary has done on a build before.
I did have a look at the early Landrover tanks as well as they are quite square, but since I want to get the car on the road for the summer, I don't want to spend too long on choosing! Maybe for the next project....a cordite maybe
