This precision cut heavy guage brushed stainless steel plate fits behind the rear plastic of the High Speed II sign. It can be used to get your sign back to the correct height, or to provide a steel backbone to reinforce the original plastic against ball strikes.
This part is designed to keep the bulbs at the correct depth, and therefore requires at least a broken rear plastic. If you need to install it without the rear plastic, please note that to us and we will find a solution.
Here are some pictures.