Machined from billet aluminium these bolt on flanges have a male screw thread to accept the Monza and Aston range of classic fuel filler caps. An integral funnel on the back of the flange accepts a flexible hose of 2 inch or 2.25 inch bore.
The flanges are designed to be bolted to an outer panel via the 6 holes on the outer part. The PCD for the holes is 3 inch, except for the version which accepts the 3.5 inch cap where the PCD is 4.5 inch.