Amazon Best Sellers: Best Car Speaker Wire Connectors Best Sellers in Car Speaker Wire Connectors. #1. Scosche Import and Domestic Vehicles Universal 6" x 9" to 5.25" - 6.5" Speaker Adapters (1 Pair) SA69. 4.1 out of 5 stars. 559. 5 offers from $10.99. #2. Scosche Select 1988 to 2019 Chrysler, Dodge, Jeep or Plymouth 6.5" - 6.75" Speaker Adapter (1 Pair) SAC656. 4.3 out of 5 stars.