ramé-hart offers a Custom Island-in-the-sea Spinneret.
You choose the outer needle gauge.
You choose the two inner needle gauges.
If you need to consult our needle chart which details the inside and outside diameters for all gauges in both inches and mm, see http://www.ramehart.com/pdf/needles.pdf
You also choose key dimensions: E, E2, and F. Consult the drawing (one of the images).
Let us know if you have any other requirements.
We will then fabricate a Custom Island-in-the-sea Spinneret to your exacting specifications.
Allow two weeks for fabrication.
We also offer a Prebuilt Island-in-the-sea Spinneret which is in stock and available here.