Metra 82-6901 Universal Speaker Adaptor Plates 5-1/4 inch or 6-1/2 inch Speaker to 6 x 9 inch Mounting Hole Adapters Mount your pair of 5-1/4 inch or 6-1/2 inch speakers in a 6 x 9 inch mounting hole Allows a 5 1/4-Inch or 6 1/2-Inch speaker and a separate 3/4-Inch to 2-Inch tweeter in a 6X9 location Unique universal design fits many applications