US Navy Derby Cover Harley Davidson

There are several different types of covers for Harley Davidson motorcycle through out the years and models.  Please read the explanation below and use my pictures to help select the covers that fit your bike.
 
DERBY COVER:
 
If your Harley Davidson big twin has a 3 bolt, or Sportster has either a 4 bolt, or 6 bolt derby cover, then you can select the applicable cover.  If your big twin has a 5 bolt derby cover you will need to measure the outside diameter.  There are 3 sizes to choose from.  One is way smaller then the rest at 6 1/4".  This proves to be a little tricky to measure because the face of the derby cover is domed.  It is best to remove your derby cover and measure the back face that is the flat gasket surface side.  Another method would be to cut a 7 ¼” & 7 ¾” circle out from some thin cardboard.  This will allow you to hold the cut out around the derby cover to compare the 2 diameters and determine what will fit your bike.  There is also an additional charge for a gasket that will come with the 7 1/4" & 7 3/4". 
Any questions, contact me. I am always happy to help out.