So far I know the caliper is the same part number. 45290-HP1-006
The '05 lower 'A' P/N is 51350-HP1-000
The '06 lower 'A' P/N is 51350-HP1-600
By studying the photos of the steering knuckles, I can discern a difference.
If the dimensions where the 'A' arms attach to the frame are the same, then I can deal with the rest; just use '06 steering knuckles with '06 'A' arms.