The difficulty is the 2 carb inlets are 8mm OD and the fuel pump is a single 6mm OD outlet. To keep the joins to a minimum and avoid extra step up unions I really want a splitter like this:

But in metal and I'm finding it really, really hard to find.
Ideally one like this with a shoulder:

This one is actually the closest I found, but it's 8mm 5mm 8mm, and obviously I don't want the 5mm (1/4") inlet to be sloppy or too much of a restriction.
(http://www.carbuildersolutions.com/uk/p ... mm-and-5mm)
Any help gratefully received, thanks.