You may have an issue with the top bridge sitting higher than where it did with the old bearings. The headlamp "ears" may have a gap between the top of the ears and the upper top bridge. I had this problem on my '76 750K and '76 GL 1000. I ended up using the old upper bearings and the new tapered bearings on the lower. The top tapered bearing is thicker than the old ball bearing. I believe I used the thinner washer for both bikes.
-P.