If I recall NAPA can get them form the Dorman catalog, and I'm sure any spring shop has them in stock.

When you put it in don't expect the center bolt alone to draw all the leaves tight, use a couple C clamps in addition as you snug it up, then trim to length.

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-