On early MK 1 motors, the IS pulley had the guide ridges. Later MK II motors that were essentially exactly the same, did not have the lateral guides.
Every car that I've ever worked on, which had a TB done before me, had missing chunks off the sides from where some meathead used a screwdriver to try an pry off the pulley, instead of carefully pulling on the center. I usually just file down the sharp spots on the pulley edges and put if right back on. I've never had a problem.
In theory, the 'D' should work just fine, so long as it goes on the intermediate shaft.