Candy colors are as much a result of application as formula. Unlike standard metallics, the silver metallic base coat goes down first, followed by a number of thin coats of transparent "candy" color, applied with flash time between coats until the desired color is developed. A clear topcoat gets sprayed over the midcoat after that.
House of Kolor and Colorite both make excellent quality candy reds that are a dead-on match for Honda Candy Ruby Red. In HOK, you want Orion Silver FBC01 and candy red UK01, plus the primer/sealer and clear urethane topcoat. From Colorite, you'd specify 1972 Honda Candy Ruby Red along with their matching silver basecoat. They don't supply primer. Any urethane topcoat can be used (they might supply their own, now). PPG, DuPont and Sikkens also have candy reds that should match but I'm unfamiliar with those paint systems. (I'm partial to HOK, it's a bastard to work with but the results are spectacular and very durable.)