I am going to buy the Momo Millenium steering wheel, but I cannot
find a suitable hub adapter anywhere. Does anybody know where I can get an adapter that will that will trick out the aibag sensor, adapt the horn button and be the right configuration to maintain the funcionality
of the turn signal return

 

I just got one from Corksport last week.
They have some in stock.

corksport

 

Ask for the Mazdaspeed steering wheel hub.