If you already have alloy rims, then you should be able to use the same
lug nuts on the SA alloys. If you don't you should get the lug nuts
designed for alloys. They are available at BusDepot (amongst others.)

My Westy Syncro had alloys so switching to the SA wheels was as simple
as mounting them. My 7 Passenger Syncro did not so I shelled out the
money for the OE lug nuts from Bus Depot (at $10.75 a piece, that was a
fair amount...especially when you need 25).