I have never seen the top one before, and I also think it's an imposter. I supplied the bottom photo a few months ago, it's unique to 1967, the first year disc brakes were available. The correct spelling is DISC, not DISK.
The top one is cheap Asian knock off of the Chevy "disk" (sic) brake centres that someone has just stuck a Pontiac decal on to. The one that Clint posted is real and correct.
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Hillar
1970 LS4 (eventually an LS5) Laurentian 2dr hdtp -and a bunch of other muscle cars...