RetroSound® Standard Stereo Speakers 4" – Retro Manufacturing
RetroSound 6.5" 2-Way Speakers Coaxial Car Audio 50 Watts Max - Pair | eBay
Customer Reviews: RetroSound D-572UK Dash Speaker D-Series single 5"x7" 2-way dash speaker with dual voice coils — stereo mix from a single speaker at Crutchfield