Big Block Mopar RB series 7.25″ internal balance, iron, orange paint, applications 440 CID 1966-1968 yrs. Professional Products’ Restoration Harmonic Balancers provides enthusiasts who are restoring older model vehicles with a very cost-effective balancer that is visually and mechanically identical to the Original Equipment balancer. The dimensions and timing marks are the same. Please e-mail with questions.