Hilux Water Tank

Try a sheetmetal shop. Cheaper than a 4x4 shop. We could do it if you were in Adelaide, but you're not (so we can't).

Good luck.

I was unable to find an off the shelf tank and so had a custom stainless steel 60L tank made.....fits nicely under my tray...if you still retain the ute body then circumstances may be different to you for size and design

if yours has a tray fitted then get back to me and I will give more details of mine

cheers