This head lamp systems fits the following:

cars- Dodge    37,38

This head lamp systems fits the following:
cars- Buick     36,39      
cars- Chevy    39,40
cars- Chrysler 36
cars- Dodge    35,36,39
cars- Pontiac   34,37,38,39
cars- Olds       34,35,36,38,39  
cars- Plymouth35,36,37,38
cars- Stude     35,36
cars- Nash/Layfette   37

trucks- Chevy    41,42,46,47
trucks-
trucks-

This head lamp systems fits the following cars only, not trucks:
37-38  Buick    
37-38 Chevy
37      Olds
37      Willys

This head lamp systems fits the following:

cars- Dodge    37,38

This head lamp systems fits the following:
cars- Buick     36,39      
cars- Chevy    39,40
cars- Chrysler 36
cars- Dodge    35,36,39
cars- Pontiac   34,37,38,39
cars- Olds       34,35,36,38,39  
cars- Plymouth35,36,37,38
cars- Stude     35,36
cars- Nash/Layfette   37

trucks- Chevy    41,42,46,47
trucks-
trucks-

This head lamp systems fits the following cars only, not trucks:
37-38  Buick    
37-38 Chevy
37      Olds
37      Willys

These LED amber turn signals are designed to stick in the bottom of an H4 head lamp. They are both running lights and turn signals.