Yesterday I found that the 2008 Parts Catalog for the Dyna, publication number 99439-08A, contains a typo.
On page 64 there is an illustration (duplicated on page 66) of the front fork. The screws for the axle holder (end cap) are shown as having different lengths and index numbers. Index number 1 is listed on page 65 as part number 4042, which is correct. Index number 31 is listed on page 67 as part number 46614-06. This is incorrect, as are both illustrations.
According to an H-D tech I spoke with yesterday, you should use two part number 4042 screws to secure the end cap, even though the illustration shows a shorter screw on the trailing side of the cap.
It logically follows that the lockwasher, index number 3, part number 7062, should be used in both places as well.