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 three different treatments for door top trim rails, and two different cockpit front trim rolls. 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 second version used two-piece door top rails with wood for most of the straight length, and a cast metal piece for the front curved part. The front end of the metal piece was contoured the same as the early all-wood part to be parallel to the early all-wood front rail (tangent to the door to body joint). The first all-wood door rail and the early two-piece door rail should be physically interchangeable. These pictures however show the interim metal end piece being mismatched to the later front rail with squared off ends. Garon Curtis in Fair Oaks, California, USA has this early cast piece with the front end angled to match contour of the door shell rather than squared off like the later models.

The third 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 metal piece of the door top rail was also squared off at the end to match the front rail. See also article INT-106A