I'm not sure what you need, but here's another Spicer catalog and on page 72 it indicates at least by application that you need a different part http://www2.dana.com/pdf/K350-1-DSSP.pdf

Simplest way to get the right thing is take the old one to the place that sells the new one.

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
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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-