You list the sector shaft seal first, and thirdly the "seal". I believe these are duplicates. That "seal" is the GM sector shaft seal, and the one I used after the lousey one in the rebuild kit allowed leakage.
You did not mention lubricant for the box. Some use SAE 90 gear lube, but it may leak. Penrite makes steering box grease which is much like came in the box originally. Worked great for me. The original grease from GM, Part #4318039, is no longer available, but I give you the number so you can check if you wish.
