These speakers are designed with a shallow mounting depth for easy install into our 1960-1987 behind seat speaker brackets (part numbers SBNBK66, SBNBK72, or SBNBK87). These speakers will perfectly match the upgraded kick panel speakers already available for a clean, crisp sound. These upgraded 6x9 two-way speakers are designed to handle 400 watts max. power (45 watts nominal). The conex damper delivers higher power handling and deeper bass, and the 2 inch cone midrange and 3/8 inch dome tweeter reproduces highs with great performance.