Installation:

1. In OpenIV, navigate to update.rpf/x64/dlcpacks/mpexecutive/dlc.rpf/x64/levels
2. Enable edit mode in OpenIV
3. Further navigate to gta5/vehicles/mpexecutivevehicle.rpf
4. Replace the seven-70 files with the files in the mod "car" file
5. Go back to levels and open mpexecutive/vehiclemods/seven70_mods.rpf
6. Replace the spoiler files with the files in the mod "wings" file

Enjoy!

P.S. You may need extra mods to stop DLC cars from despawning.
Such as this one @ https://www.gta5-mods.com/scripts/mplowrider2-in-sp

Do not redistribute without permission.