These premium speakers replace the defective speakers in your CADILLAC from model year 1958. The speakers feature dual voice coils with separate right and left channels and replace the original mono speakers exactly in their original installation locations. No vehicle modifications are required. This allows modern stereo radios or digitally converted original radios to be used without compromising the vehicle’s originality. Compared with the original full-range speakers, they also deliver significantly stronger bass and crystal-clear highs for noticeably improved sound reproduction.