I rarely have luck with an easy out.
Very carefully welding on broken screws and bolts and grab the weld with vice grips almost always works in my experience.

I’m not aware of an off the shelf replacement fan.

•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-