I was thinking the manufacturer incorrectly labeled the package and this shade fits another vehicle.
I did considered relocating the limit screws inward a half-inch on each side as to allow the end caps to depress further in, but was still concerned that the cap's square protrusions would actually fit the Suburban's teardrop-shaped receptacles.
All in all, was easy-peezy to print off a label, tape to the box and UPS swing by the house to gather the box and return.. Amazon already refunded my card.