Here is a close up of my two blocks. I think you have mixed up the length of the final piece that goes on the left hand side and the piece with two triangles that goes on the right hand side.
In my pattern it says that D should be 3 1/2 inches by 18 1/2 inches. Is that what your strip measures?
Last edited by GingerK; 10-25-2017 at 01:12 PM.
Reason: had to double check original pattern