Which Paint?

Okay folks I have an ultimate engine steady bracket fitted to my 1990
Mainstream Mini Cooper and I bought it from Moss about 6 years ago.
It's whats called the Injection type (strange considering my Mini has a
carb, but it's suitable for all later Rover Mini's fitted with the
1275cc engine really).

Anyway the threaded area has gone a bit rusty looking and I know a good
clean up with a wire brush will sort that, but is there a good paint I
can use that will look nice and stop the rust reappearing too?

Oh and i'd rather not remove it from my car, so I want to be able to
use a small brush to apply the paint.

Here's the part in question:-

http://i97.photobucket.com/albums/l236/taffy1967/Mini%20Stuff/EL59EngineStabiliserI.jpg

And how it appears after almost 6 years of heavy use:-

http://i97.photobucket.com/albums/l236/taffy1967/Mini%20Stuff/EL59EngineStabiliserIII.jpg

Any help greatly appreciated.  ;O)

Taffy