Not the best picture, but should show that the 48-53 ignition switches don't have a bezel.
The whole switch just slides in from the back of the dash and held with two screws.
https://photos.app.goo.gl/g3EnHEqh3TaXxVK77

The stainless/shiny part is the end of the lock cylinder only


•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-