May be an easy question- what size is the headlamp on the 05 Deluxe ?

 

Stock was 7 inches in diameter.

Now if you are asking about the bulb. By then HD had gone to a replaceable bulb in the H4 series. Many replacements are available but pay attention to watts, amps, lumens, and heat.

 

Ok, but how do you mesaure, the house or the glass?