used is your only choice.
I put an add in the parts wanted section and had mine in a week or two.
you probably need more than one, they may all be different, be sure to get the ones you want.
For my truck the front left and right were different, the rear two were identical, but that is a 2 ton. Check the parts book for yours so you know the difference.
Good luck

•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-