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Looks good! Thanks for the feedback.
We haven't seen any fitment issues with the 2018 models. Do you have any accessories installed on the ECU side? Maybe you can send us some pic's of the harness that's not fitting. The X3 ECU and battery covers are the same style and design that we originally manufactured, haven't had any changes or deleted any tabs. Send us some pic's and we can try to get it figured out or give us a call 480-718-5511.Just installed mine yesterday. Not sure if the '18 is different but one of my harnesses from the ECU to the engine doesn't quite fit so well in the cavity with the rest of the ECU. I had to use a little more pressure than anticipated to get it to fit even after using a few zip ties to try to tie it back more.
Also just wondering why the covers don't have tabs that would fit nicely into the holes on the factory plastics? It appears the ones in this post when it was first started do, although they also look like they're on the front side and might not fit so well.