you said to comment if it works with vts and ive tried it and it doesnt, idk how but the harness textures and the seat textures seem to have swapped reference image https://imgur.com/gallery/KUC53b9 im gonna try with the uae since you didnt know if the vts one worked so i assume that one does
use Unity Asset Explorer. open Assets file, go to your mysummercar_data, select sharedassets3. then search racingaccessories.TEX not mat, right click and extract file.
Now the extracted file is in the UAE folder, now go to the folder that says sharedassets3 in the Unity Asset Explorer and replace the image file ONLY with the new texture. Then import to DDS. It should work, then make sure to save files to make sure it actually saves to the sharedassets file.
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reference image https://imgur.com/gallery/KUC53b9
im gonna try with the uae since you didnt know if the vts one worked so i assume that one does
Now the extracted file is in the UAE folder, now go to the folder that says sharedassets3 in the Unity Asset Explorer and replace the image file ONLY with the new texture. Then import to DDS. It should work, then make sure to save files to make sure it actually saves to the sharedassets file.