I'm not that familiar with the power flow bagging systems, but there were a few different 48 inch systems depending on tractor or if it was a zero turn. Your best bet is to go to your dealer and get his advice.
I recently purchased an X500 with the 54' deck (love it)! I have been looking for a bagger and found someone with a 2004 model pwrflo48mow. Does anyone know if this will work on my X530?