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@Sanddancer
I'm totally confused and think I'd be best looking for a whole new headset. The box I have says Orbit MX. The tech docs from FSA say that should be 36° x 36°. Yet the new bearing that fits in the headset says TH Industries 1-1/8" ACB45° x 36° 873. I have an old, but functional bearing that I think says TH Industries 1-1/8" ACB36° x 36° on it, but that one won't fit into the cups...just a gnat's pube too large.
Just noticed that this one I have didn't come with seals either. Ho hum.