Q: can you replace a 5" head with a 6" head. head only, will they interchange?
A: If the 5" light is a model H1, they should be interchangeable. If it is a different model (model number is located on the head of the light) we will need to know what model to check.
Q: Do you still sell the hole arm and light in crome for the H1?
A: Full current H1 Spotlight assemblies can be found here:
And the vintage style H1 spotlights can be found here:
The correct spotlight to use will depend on the make model and year of the vehicle the light is being mounted on. Correct parts can be searched for here:
H1 is listed as "5 in Halogen Spotlight"