These speakers are designed with a shallow mounting depth for easy install into our 67-87 Behind Seat Speaker Brackets. These will perfectly match the upgraded kickpanel speakers already available for a clean, crisp sound. These Pioneer Upgrade 6x9 two-way speakers are designed to handles 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.