Are you sure you have a wide glide owners manual? The 1999 service manual says the wide glide uses 10.2, all other Dynas it is 9.2.
In 2000, it changed to 12.0 for the wide glide, 10.7 for the FXDL, 10.6 for the FXD, and 11.5 for the FXDXT.
So service manual wise, the only 9.2 amount I see is for pre-2000 non-wide glides.
As a tech, I'd go with the service manual all day...12 ounces
And while steveusmc is correct that often you'll see a "dry" vs "wet" amount... in the 2000 manual, there is no differentiation. The amount I listed is described in the section where all you are doing is draining the old oil and pouring in the new. In the section where you tear the fork all the way apart and clean it, it refers you to the "fork oil change" section for the amount.
This is probably WAAAAY more info than you were looking for, just thought I'd give you all the info I had at my disposal.