[Healeys] cockpit finisher rail nuts

[Austin Healeys List]

Does anyone know what sort of nuts are used on the two left/right side
forward ali cockpit trim rail screws behind the shut pillars on a BN4?
The others going around the rear have J shaped brackets but there
doesn't appear to be enough room to get them in behind the shroud at
the front. The parts listings don't seem to show anything.
Andy.