The tank is in my other van (not at my house). I think from memory its the same size as yours as it has a circle on on eside where the lid would be for an upright. It fits in a berlingo longways with the filler on the rear right top corner and the tap on the left bottom corner at the rear. Its baffled and in good clean nick the lid also has a hoselock connector in it to fill up. Its also got a cage with a lid. All a bit homemade from lightweight 1" box section but usable.
Thanks
Andy.
I'll measure up my vw today and see how yours would fit in as I want to get a smaller upright for the berlingo.