A mounting adapter for a mounting and fastening system includes: a radially inward portion including a throughbore having a throughbore axis; an inboard end including an adapter inboard surface extending transversely with respect to the axis, and an inboard counterbore in the adapter inboard surface in communication with the throughbore; an outboard end including an adapter outboard surface extending transversely with respect to the axis; and a radially outward portion having a tapered outward surface that tapers in an axially inboard and radially inward direction.