Also, I’ve never seen parking brake cable anchor brackets to go with the brakes on the 10 lug Dana 70HD or 80.
Which if non existent means that parking calipers also don’t exist for that setup... or if you found something you’d need to make the brackets.

•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-