My 71 442 still has its original 5 SSll wheels
the bezel on the wheels are smooth with just one slight ridge in the center. The bezels on most cars that I see have several ridges going around them. Most all repro
bezels also have the ridges. Why the two kinds?

 

There are actually 3 types of bezels for the Oldsmobile SSII/SSIII wheels. The correct one for your 1971 is shown top right in this picture:
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I am constantly learning new information on this forum. I never know there were two different variations of the wide bezels. What is the year break for the wide bezels? I believe the last design was introduced mid-year on the '78 models.