Response to this posting in another thread. They are all made under the PGI umbrella.I just got 6 of the "various manufacturers PG4612EX" from Rock Auto. 2 came from one warehouse and 4 from another. Here they are, physically identical as far as can tell. I'll need to compare to the CarQuest premium tomorrow.
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^^^ They are both made under the PGI umbrella. The Carquest Premium in also under the PGI umbrella.