I haven't looked lately but I was finding them on eBay and at swap meets new for far less than restoring old rusty ones would cost. The bottom housings where the socket is are usually pretty rusty and disappearing. Might look around before spending serious money on new chrome.

•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-