I have a 47 1.5 ton. I dont know if you have Isuzu trucks over there. I found a mid size isuzu truck tank that had the same mounting centres (400mm I recall), baffles in the tank at the right place for the mounts, and dimensionally it was a couple of inches shorter end to end but only about 10mm out height and width. i could have used the Isuzu mounts but the Chev ones were perfect with about ten minutes smithing. So it may pay to have a look around a wrecker.
I unwound the nichrome wire off the chev fuel gauge sender, rewound the Isuzu one with it- that was a mission but it worked.
The filler cap was in a different place, but fine, and its locking cap sealed nicely. I ran a new tube for the vent up to the underside of the deck and down behind, all good.
