That's so cool, dude!
A game for people who have arachnophobia. (I'm one of them lol)
I'll follow you so I don't miss the game.
Easy!
1. Double click on FBX file and open import settings.

2. Click "Actions" and next "Extract materials"

3. Choose the folder where you want to import the materials. Then double click the material.

4. Open the Albedo tab and drag & drop the texture from the FileSystem panel. (Or use Quick Load there.)
And voilà!
P.S. If you didn’t make the model local to the scene, everything should work automatically.

Thanks, man!
I use basic textures or photos (like painted metal, wheels, etc.). Then I do a UV unwrap and export the UV layout to a graphics app (I use GIMP and Aseprite) and paint the textures there.
The headlights are just a photo that I paint onto the model in Blender using Stencil mode (it works best when the image has transparency).
You can find a lot of tutorials like this on YouTube.
P.S. This is the UV layout I made in Blender and then painted over.

Hello! Thank you for your message.
Please note that Itch.io generally doesn’t offer refunds for digital products once they’ve been downloaded, unless there’s a technical issue or the asset doesn’t match its description.
Since the asset description accurately reflects the content, I’m afraid refunds can’t be issued just because it didn’t fit your project.
Thank you for understanding!