I expect the spindles are the same, but hubs will need to be changed.
Some people mention removable adapters for dual to single on the front hubs but I have yet to see such a thing (that isn't aftermarket). I think many people get confused thinking that the bolts that hold the drum on a dual wheel hub are really holding a spacer/adapter, but so far all the dual wheel hubs I've seen were one piece, not a removable adapter. If there is such an adapter I'm curious what models and years it was used on.
Grigg
