LM036. 4:2:1 Manifold for 1500cc Midget . Triumph engine
This and the Triumphtune manifold are the only tubular manifolds I’m aware of for 1500 Midgets.
This Maniflow item has much nicer mandrel formed bends and shaped collectors.
It comes with a sleeve to allow fitment to the original standard exhaust system, but alternatively you can use the LS036. Single box Fast road system (see this store for details)