Looking for a name, Part 73682

[Gerald Lasser]

Slope Brick Curved, 3 x  3 Rounded Corner with 2 Studs

(I'm not sure I see the necessity of "inverted cutout" in the sister part, so I've omitted it here; to me the staggered underside is the more important functional aspect.)

Thanks That sounds good, may be adding "concave", Slope Brick Curved Concave, 3 x  3 Rounded Corner with 2 Studs