size of replacement tank

i have also herd this but you must shift your large muffler and i am unsure about a filler as it is a ute body

I fitted one to my Hilux some time ago using another tank of the same model. I just turned it around and mounted it on bits that were already there. I put in a switch that changed over the guage and the tap at the same time. It worked just fine, I did have to re-route the exhaust pipe a bit and that was done at the same tme. Fairly easy if I remember rightly. The Hi lux is long gone, about five cars ago.