The "seating area" (or "seat") is the area of the lug nut, and the area of the wheel, that come in contact with each other. Stock Honda/Acura wheels have a ball/radius/spherical shaped seating area, and need lug nuts (such as stock lug nuts) which also have the same shaped seat. After market wheels use a tapered/conical/cone shaped seating area and need lug nuts (including most tuner lug nuts) which also have the same shaped seat. No, it is not safe to mix and match (stock wheel with tapered lugs or vice versa); the contact between the lug nut and the wheel will be insufficient, putting undue stress on them and potentially causing failure.