Using the Shimano tech docs as a reference, I see three different part numbers for the complete freehub unit for 105 5500, 5600, and 5700 rear hubs.
5600-Y-3CJ 98070 (The tech doc indicates this is completely interchangeable with the 5501 unit)
5700-Y3TA98060 (The tech doc indicates this is non-interchangeable with 5600)
I have a complete freehub unit marked as Y31D98060. The package also says it's FH-1056 C-TYPE. The seller indicated this was for a 5600 hub.
There's some confusion here since the last five digits of my freehub part number-98060 match the last four digits of the tech doc's 5700 part number, but the FH number 1056 would indicate it is for the 5600 hub. As stated before, the tech docs indicate 5600 and 5700 freehubs are not interchangeable.
Anybody have any insight on compatibility?