Correct, On on the outer arm of the "Y" brace, so I am told.
I had mine in-between the braces at the "Y" and I will admit they do "look better" spread out a bit. But that may be more of a personal opinion than "Chevy specs"
In reviewing a lot of photos, cars and mag's I have not seen any definitive evidence that show them one place or the other. But a lot of guys on this site told me where to-install them.
I just finished taking my fog lights off, disassembling them and cleaning/polishing, washing etc. them. Then I rewired them put them back on, and they look nice.
So it's kind of a personal thing...I'd say just install them, stand back about 50 ft. and see if you like the "look" of your placement, then smile !
Be well,
Mike41