Shelby Daytona Spoiler no option in vinyl

Noticed when i was trying to make a custom livery for the Shelby Daytona, you cant add vinyls to the stock spoiler. It just ist doesnt appear. So say if you are doing custom racing stripes, the stripes go under the spoiler, not over it. I tried to see if this was something that was already mentioned here in the forums but couldnt find anything

yeah i know this been a issue for a while. kinda wish it was fixed. couple parts by the window cant be painted either