Here is the Speedi Sleeve catalog.
http://www.skf.com/binary/26-128020/11337_2-EN-SKF-Speedi-Sleeve.pdf

If you know the seal part number and can look up the ID you can get real close just looking for that diameter in the catalog link above.
Be smart to actually measure the shaft and confirm before ordering. In my experience NAPA can order the sleeves as needed, you may have a bearing supplier near by or better source?

•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
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-