I am looking at replacing the front chassis frame on my Mk1 - sometimes referred to as the H-section. I notice that Moss parts don't list one for the Mk1.
Is availability of replacements this section a problem then?

Is there any interchangeability with this and the later "(c) H-AN6 to (c) H-AN8, (c) G-AN1 to (c) G-AN3, 948cc-1098cc" version they list?

Presumably any of these come with the angle already in place for the longitudinal rails for achieving the correct caster angle?