It still is ? I don't know any mods who are not available anymore really but i'd say maybe jsz's hawkeye sunburst.
Theres a couple pretty good mods that got removed that i still have, but i prob cant even list them without risking a ban sadly.
charger and challenger mod os as the r34 im sure im anyone remember this one but the ek9 mod for 2020 dec
There was a Hearse mod for the LeGran that would be a load of fun with all the parts available for the LeGran now. I would love to see somebody bring that one back. I tried to update the mod myself and failed miserably.
I agree, it should be easy but when I tried all I got was an exploding hearse. It was sort of amusing but wasn't what I wanted. I can sort of hack my way through some of the jbeam files but when it comes to anything harder than adding ABS to the Burnside (I know - WHY?) I get lost fast.
Charger, Hyper Bolide, and JsZ's Sunburst. Wow! I luckily downloaded the Sunburst like an hour or two before it was removed. I went back to look at the description again and it just lead me to BeamNG's "not available" page. It isn't my favorite though, I just wish there were more configs, I'll probably make some and then it'll be my favorite