Here is a wing mount (one side) that is designed to be a crush structure as well as a mount for the rear sway bar and the rear wing. It also has a receiver for a quick lift jack. There are 5 spacers between the 2 side plates.
It is designed for the Staffs transmission. The wing mounts on the top in the 2 rear most holes. There is a separate plate that mounts to this mount and then the wing mounts to that plate. The plate that the wing bolts to allows for fine adjustment of the attack angle of the wing and the plates are designed to give the desired wing height relative to the diffuser.