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 Powerbond produces several excellent and affordable harmonic dampers that are direct replacements for the common ’68-later Pontiac unit. Butler Performance sells the stock replacement (PN PBO-PB1056N), which Powerbond suggests for applications up to 400 for $75. PN PBO-PB1056ST (shown here) is ideal for high- performance applications up to 600 hp, and sells for $90. We chose it when seeking to replace our Firebird’s original.