The 1008 Custom Autosound dual dash mount speakers are designed to replace OEM speakers generally held in-place by screws. These speakers give you stereo sound from your original mono locations. This 5 inch by 7 inch mount features two 3.5 Inch, 80 Watt Speakers designed to align and mount in your factory speaker location. If you have an original 8 or 10 ohm radio, you may still use this speaker, but you will have to wire it in series and may or may not have to add an inline resistor. Please be careful when using with an original mono radio as improper wiring may fry your original, 8 or 10 ohm radio.