VF500 Carb Inlet Manifold

Hi there, I am restoring a UK Spec 1986 VF500 F2. I am having problems trying to get a manifold that goes between the Carburettors and the airbox as there seems to be two different sizes! I have found two but the centre to centre of the holes where it fits to the carb tops are 63mm where on my original they are about 59/60. The inlet holes on my manifold are also 3mm narrower in width.
Have I the wrong carbs on my bike, or is the US interceptor model fitted with different carburettors?

Any feedback would be greatly appreciated, I am worried someone has previously fitted some VF400 Carbs instead!

Many thanks