I used these since the included ground wire allowed me to get rid of the original ground straps that were pretty rusted out.
https://www.amazon.com/dp/B002H9BF5Q...roduct_details
The plate helps if the hole in the housing is weakened or cracked. To secure it I used 1 inch of 5/8 heater hose. I placed the sockets through the housings and used soapy water to slide it on. I then used glue around the end, being sure to NOT get glue in the socket. Much more weather tight this way and hold is secure.