A little hooked puller widget might yank the one on he right out.
The one on the left, if it seals any, might come out by over pressurizing with a grease gun, might also split the housing...

Drilling and threading a small slide hammer in sounds like a good idea too.

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-