Not sure of the correct term but like the panel that needs removed under the engine to change the oil... there is also one shown under the trunk area from the diff back. I never looked at this on my car until last weekend when I was installing the Diode Dynamics / Form rear reflector lights and...
Dug into a few projects over the last week. Installed an Escort Redline 360c with a blend mount and a mirror tap first. We have two other FoMoCo products. A 23 F250 and a 24 Lincoln Nautilus. The Mustang must pack the same tech behind the mirror. Speed limit cam, rain sensor, high beam sensor...