Watching the current Aussie* LEGO Masters TV show prompted me to actually acquire the only full-size LEGO piece that fits (really well) on a real Abarth.
Had seen lots of others, mostly in the UK, do this engine bay mod. The official LEGO® 4-stud Storage Brick lid fits perfectly, with a bit of trimming, to tidy up the slightly scruffy battery area. It's entirely appropriate given the 'fun little toy' character of the Abarth too 🙂
I was sceptical it would cope with the engine compartment temperatures but, apparently, it is fine. Time will tell?!
* The best of the worldwide variants due to host Hamish Blake I reckon
It's simple to do but this short YouTube from Abarth Club North East - @RJABARTH saved a lot of trial an error as shows where to trim. The box is a softer plastic than actual bricks, I cut it with a sharp craft knife and filed the edges smooth.