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The square head design TOB is being passed of as "heavy duty upgrade" when in fact that design is for a Corvette clutch fork which is different than a Camaro/Firebird clutch fork.
FWIW that is what McLeod told me when I showed it to them while they were rebuilding my Street Twin. It looks like it has more meat on the bones and did come with my SPEC 2+ when I had that clutch. It also worked with my "F" body fork. I now run the one that came with the Twin....which is the same "made in China" one that comes with any LT1/4 clutch kit
My square top TO bearing has no markings on it saying where it is made...the other, no square top, ones do say made in china though