As you all surely know, the open D also has an 8" headlight. I believe the stays are also longer than those for the 7 inch job, probably in the flat sections. When I installed new ones on mine, I encountered a problem. The headlight shell fouled the round portions of these lower stays, forcing the light to point to the heavens. Maybe that's as it should be but I didn't like it. By adding some spacers (distance pieces) to a longer lower bolt, I was able to bring things down to earth.
These are simple parts but the geometry gets a little tricky.