Gself,
Suggest you phone your broker.
Comsec have included the, in this case 4 cents in transaction for each right and you have to be careful buying $500 worth as this will become quite a larger amount when paying for share is included.
Additionally I,m suspicious in the AMXR case buying a right may give you the complete package of, was it, 9 for 4, plus the great little options.
Yep phone your broker for the right info
Cheers, YF