Jerry, the assembled inner wheel bearing height or width plus the newly made seal ring spacer cant be more than the original assembled bearing height or the hub will be shifted from the original position.
I've started to look into this and I'm not sure they make a thin enough tapered roller bearing assembly with appropriate ID and OD. Perhaps they do?

I believe the links provided above to threads with original bearing specifications, possible replacement bearings, and and the Timken catalog together can answer this question if you have the time and desire to go through it, find possible combinations and make the calculations.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-