After a six month delay, I now need to finish my K3 serial port adapter connector.
Looking closely at the picture of the J14 connector cover in the prior post in this photo sequence:
It can be seen that it is a two part molding.
Lifting on the outside edge, the "spacer" part will swing in its pivot:
Click for: j14 half open, full image
When the "spacer" part is in an up-right position, it will lift out of the pivot point:
Click for: j14 open, full image
From the "spacer" part, the detailed dimensions may be taken and added to a sketch of the part. This will give the required dimensions of the mating tab to be made.