This car was in the game for a while, before the game was released. For some unknown reason, it was cut out, and the only mention of the fact that the car was once in the game, and the very image of this car were preserved on the official website of GTA1. Based on the preserved image, I made a reconstruction and adapted it as a replacement for another car.
Installation requires GTAcars... Open the file style001.g24 with the program (these are the textures of the city of Liberty City), which is located in the folder with the game. You need to replace the texture c_car1_46.bmp, for this, first place my mod (modified c_cars1_46.bmp) in the GTAcars program folder. In the file Style001.g24, opened with the program, find the van (the archive with the mod will contain an image of the car that needs to be replaced). Click on the van to be replaced, and in the action bar, click on the triangle with the letter C and the arrow turned to the left. Don't forget to click on save changes.