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Strange lightweight front disc brake kits are for drag race only.
Fit '2002 and earlier (first generation) Viper front calipers and 11.75" x 1.25" rotors on Mopar '62-'72 B-bodies and '70-'72 E-bodies equipped with stock DRUM knuckles
DoctorDiff 13" viper-style front disc brake kit for use on classic A, B, and E Body Mopars. Fits '70-'72 B/E and '73+ A/B/E/F/M/J/R disc knuckles.
11.75" front disc brake kit with Wilwood calipers includes all new hardware. The package fits '62-'72 B-bodies, '67-'76 A-bodies and '70-'74 E-bodies.