For thoses who may care about concours details, there are two styles of eared wheel knock-offs the Twin Cam / Deluxe chassis. The style changed at car number 1826 in April 1959. The earlier ones were steel with the flatter face and slightly squared off ears. The later ones were bronze with rounder face and rounded ears, more like the usual wire wheel KO nuts.

For the German/Scandanavian market there were also octagonal wheel nuts introduced at car number 708 in October 1958

Beware that Twin Cam knock-offs do not fit other MGs and vice versa, as there is a diference in the contact angle between the knock-off nut and wheel.