From looking at the part finders, it looks like they were used up thru 2008. Maybe they weren't used after the frame change for 2009 models.
In 2009 the was a service bulletin M-1248 which was to decrease the turning radius on the touring police models. It changed the upper fork bracket to 45435-10. The 2009 & 2010 Road Glide use the same part number. The original was 45435-09 that was used for the 2009 model and superseded by 45435-10.
M-1248 , 2009 POLICE MOTORCYCLE FORK BRACKET PRODUCT PROGRAM 0908