Sale is for a vintage new Standard Motor Products DR-3X Ignition Coil as pictured. "Blue Streak" is SMP's label for their premium quality line. For 12V negative ground and external resistor applications.
Listed in SMP catalog to fit:
1955 - 1958 Chevrolet passenger models with V8 engine
May have other applications not listed. Verify suitable for intended application as returns are not accepted.