We wanted to “upgrade” the fuel filler pipe cap in favor of an “Aston” cap sold by Sports and Classics https://www.sportsandclassics.com/parts/austin-healey/austin-healey-100-6/fuel-system-austin-healey-100-6/le-mans-aston-gas-cap-austin-healey-mgb-mgc-midget/
It is a nice looking cap and from a practical standpoint its installation does eliminate the fear that one might drive away from the pump without installing the filler cap. The cap is polished cast aluminum. To make the installation work we purchased a used fuel filler pipe from an Austin-Healey 3000, cut the lower end off so that the modified pipe was 9 1/4″ long and epoxied the brass screw collar for the cap to the top of the pipe.
We were then painted our new pipe with POR 15 and fit it through the rubber body seal and into the rubber 2 1/4″ elbow hose to link it to the fuel tank. The elbow hose is used in later Sprites and MG Midgets and was available from Moss Motors. https://mossmotors.com/282-945-hose-filler-to-tank
Two hose clamps were then used to secure the hose to the pipes.
The components and the installation of the cap is detailed in Bugeye Restoration Video Episode Ninety-six:
https://vimeo.com/1050923286/e891e27912?share=copy