Yes it is a 7/16 allen. The problem I found was that a 7/16 allen wrench isn't very common and it is harder to find.
I just went to a local hardware store and used a 1/4 inch threaded rod coupler nut, the coupler nut is longer than a regular nut which make it easy to work with and it removes the oil housing with no issues.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.