I have seen early and late style links, but not yet wide and narrow. Both afore mentioned styles are about 3-3/8" wide, excluding any washers. The SW forks are flatted slightly on the inside to clear the outer edge of the brake drum, and if your brake drum is only fouling by a slight amount this may be all you need to clear. Even so it only just clears. If you are fouling by more than that, it may be that there are various offsets to brake drums, and you have one that is not dished enough. Not sure if Douglas was consistent with the offset; I never had occasion to check before.
-Doug