These Retro Sound 6. 5-inch stereo speakers are a great way to upgrade the sound in your classic . They use a Neodymium magnet structure for high power handling in a slim-mount design - mounting depth is just 1. 8-inches (45. 5mm). Santoprene surrounds deliver the most natural sound possible with no distortion. Mylar tweeters produce crisp, clear highs.