Take a look HERE --
http://forum.uscutter.com/index.php?/topic/39774-are-you-ready-for-some-clip-art-links-to-free-clip-art/&tab=comments#comment-304088
Also, in case you were asking about the TEMPLATES for vehicles (and not designs to put onto them)
USCUTTER will sell you their DVD, https://www.uscutter.com/Art-Station-Vehicle-Templates-2019