This is a note for concourse enthusiasts as well as a warning for fitment if you start mixing mismatched parts. Early in MGA production there were two different treatments for the cockpit front trim roll. The earliest parts were all wood, and the mating ends were angled to be tangent to the joint between door front and top body cowling, as shown in the picture at right.
(This picture is compliments of Terry Sheppard in Hampton, Victoria, Australia).

The later version is much more common. This is when the front rail became multi-piece with rubber cushion, and the ends were squared off.
Then the door top rail was also squared off at the end to match the front rail. The door rail had three different configurations. See also article INT-104A