it was an entire plug that was installed.. when building a a daytona look alike people used to use a vega hatch for the plug.. now you can buy repopped plugs.
here is the hatch that they used to use to make a look alike..
69 CHARGER DAYTONA REAR WINDOW PLUG 426 HEMI / VEGA HATCH | eBay
repopped window plug
View attachment 1715264251
View attachment 1715264252