I got an ali one made up at work, as a student project.
It's based on the original design and a bit of CAD work.
Vent pipe on top, along with the fuel return that fills a little snail shell shaped sump on bottom of the tank.
The pickup feeds out of this straight to pump mounted on the slope between the legs of the subframe, above the radiator pipes.
The filler is no the top, and this stops the slow feed needed at the pumps with the standard design.
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