Open TXDworkshop. (https://www.gtagarage.com/mods/show.php?id=8320) and go to [C:\MTA San Andreas 1.5\server\mods\deathmatch\resources\VehMod] Show content
(https://i.imgur.com/fSVm2s9.png)
and put your design in "remap_Body" Show content
(https://imgur.com/4josGsQ.png)
and save