You are overlooking the obvious: The Pelican bearing is a stock bearing, but in a single row configuration only, and used with a "spacer" in dual row applications. The single row design is the weakest and most failure prone style IMS; so you are taking out one of the strongest designs and replacing it with one of the weakest to save a few bucks................
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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