I think the JBX 100 mod looks very much like this! https://www.beamng.com/resources/ibishu-jbx100.14139/
Z10 or Z20 soarer then I have modeled some before Generally speaking though if you want a particular car ingame then you are probably better off making it yourself (or just be very lucky and have one of your favourite modders happen to want to make the same car) seeing as you have access to a Z30 in your garage then that would be super useful as a reference if you choose to give modeling one a go may also be able to play around with photogrammery to create a 3D blueprint for a more accurate model