Wing mirror holes

[kbj149]

Hi all - my TVR has pretty M3 style wing mirrors but its left unsightly holes on both sides where the old mirrors were once affixed. Whats the best way to prepare, fill and cover these? I've managed to source the paint so thats no problem but wondered how best to create a clean finish without just stuffing it with tooth paste.

Oh heres the pic: http://bayimg.com/LADEOAAcg

Thanks in advance.