I bought and mounted an aftermarket roof spoiler, because mine came without.
To me it looks exactly like the original, and was not difficult to put on, and btw, it came perfectly painted in vehicle color.
Why did I buy this one? The OEM part is very much more expensive!
This is the exact search term / which was entered in the search bar:
Painted For Mitsubishi Mirage 6th Hatchback OE Trunk Spoiler 2015 ES RF
The link: https://www.ebay.de/itm/Painted-For-...72.m2749.l2649