The NOS core doesn't have the large Harrison logo on it, but the box does say Harrison Division GMC Lockport, NY on it so I would have to suppose you are correct.
3016842 8.854 All F exc. A.C CORE, w/fittings 1 1969 1975 8-40
They are otherwise fairly much identical. At least on the outside. The picture makes one look bigger than the other, but not so in person. Just the angle.
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