You may not need the two thin rings. I just rebuilt a 44-6 motor and had the same problem. Talked to Jerry at Montes Equipment (1-800-228-2625) and he explained to me their use and application situation. Ended up not needing them. I would give him a call and tell him what you have run into. I"m sure he will be glad to help and get you back on track.
Hope this helps