10 ounces of oil in each leg with standard 41mm tubes.
30w is recommended for the +10 & +12 Front end on the Choppers, Ridgebacks and K9's.
10w oil is recommended for the +2 Front Ends on the Prostreet Models. Pitbull's, Mastiff,Coyote,Bulldog's, etc.
Not much information on inverted front ends except in the 04 Service Manual for the inverted Front Ends, it states Inverted forks use 350cc in each leg of Bel-Ray HVI 15w Racing Suspension fluid.