nurulizat, black I think, coz I enquired once when I was planning to convert my rear boot to Lancer Fiore's boot. And yes, my current one (92) is also rusty like s**t.
Leemoto, that's right, better off changing the entire boot. Even for the doors.
But a good body workshop would know how to remove and treat the rust so that it'll NEVER appear again. But badly done, it'll appear within weeks!