Because the lids and hulls are hand laid, the tolerances between them can vary. Hunter keeps three sizes on hand, 1/4", 3/8", and 3/4", although they recommend using multiples of the 1/4" units to find the best height for each application.
These are the same bumpers, made by the same manufacturer, as the originals. They have been used on Hunters built during the past 20 years or more.