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NCRS has the exact paint formula. If you just want a good match (like I did), get a "cast iron" color spray paint at the local auto parts store. If you clean the painted areas well, and let the fresh paint cure for a few days, you probably don't need to use a primer {but priming might provide a longer lasting job}. The inside edges of the 'horseshoe' moulding and the 'bumperette' piece is all that is required. I also painted my center grill that color--although the original paint was just black, I believe.
Paint them any color you like. My '72 is red with a black interior. I stripped and cleaned the three grills and painted the outside grill inserts (egg crate looking part) semi-gloss black, and painted the center grill the same color red as the car. It looks great. Unless you are going to enter your car in an NCRS judging event, who cares - it's your car. Also, use a good etching primer for long lasting paint adhesion.
Below is the exact color for the front grilles I posted awhile back.
Gray: Dupont 863-42103 to match WOA-3406" (one paint dealer reports to match WOE-340 in 1998) This spec, which is off the original print, may mean little to a Dupont supplier. Use code 9931 below for current (in 1999) match.
Use primer/sealer first then:
use Dupont code 9931 at 5% gloss level. (a flattener will have to be added to achieve this level) This code also includes an additive that will yield the rough surface of the gray area.
Upon calling Dupont directly, the Dupont Number 863-42103 is not found in their data files,but the Old Stock# Dupont code 9931 is, and is superceded by their new number for DK GRAY METALIC 723199 and that formulation date was 8/2/1990.Both paint codes were acrylic laquer,or Lucite.
The paint shops reccommend a color photo to match the existing color,since laquer here in N.Y. is no longer available.The paint can be made in a Base Coat Clear Coat.
Dupont was kind enough to fax the ingredients of the Grey 723199.Their phone number is 1-800-338-7668.