You want late model stuff I assume, to do the disc brake swap? Along with the spindles you need caliper brackets, steering arms, hubs, rotors, and anything else bolted to the spindles. Your best bet is to find the whole P30 5/10 lug front axle.
I've had no trouble finding them with a wanted add or just stumbling onto them, they're out there!

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-