Depends on colour of the car. Dark green- I'd get them painted. Red or yellow, I'd leave `em black, like mine..
Throw away the little self tappers- they RUST badly. I got some SS ones the same size from Bias Boating warehouse for a few bucks. Screw them in with a little grease.
Mine have been on there 6 years now, no rust yet on the screws or in the holes.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.