My house was built with a hall floor laid with red mahogany type hardwood. I would like to resurrect this floor. Unfortunately the floor does not exte nd far enough into the doorways and the join with the ordinary pine floorbo ards are visible when the doors are shut. I think that there was originally threshold strips about 80mm wide covering these joins. They were probably removed and discarded when carpet was fitted. The architraves are all cut a t the bottom to accommodate a strip of wood.
I have been unable to source suitable hardwood strips either wide enough =>80mm or thin enough