Making my nuts black!

I have BK alloys and they intelligently have round wheel nuts, so when i come to wanting some black nuts instead of silver i cant use conventional impreza nuts.
Bk dont do anything else other than silver, and even a thin hex shape wont fit between the wheel holes
So... is there any way i can make my silver bk nuts black???
Painting wont work as it'll surely just chip off. Im not sure if there is any other process that can make them black and stay black??

thanks in advance

Paul

Anodise them

i thought about it but is it possible? i always thought anodising happened in the manufacturing process before the shape is formed, or can you anodise retrospectively? Would it cost much do you think?

No anodising normally happens after the item has been shaped.
Price wise well i have no idea but i would guess officially not cheap but i expect cash in hand may persuade someone to do it

have you tried looking on ebay?

think someone may have pointed me in the right direction. Now i only thought bk had the round nuts, but apparently 'tuner' nuts are round too, i've since found some on the net so it looks like problem solved