Pessima MK1 weird skin bug

I downloaded a mod called "Drift Skins" for the Pessima from the repo and was excited to see it included a port of the Drift Gear skin from the BX to the Pessima MK1. However, I noticed something odd: there’s an orange stripe around the spoiler that looks out of place. While experimenting with the skin, I found that the rear part of the car is entirely blue, with no orange, just like the Drift Gear skin for the BX. My question is how I can modify the skin so the spoiler matches the same color as the rest of the rear half of the car. Thanks in advance!

Images:
https://imgur.com/a/ZVw1tLH