Since the brushes I still have from the previous model do not fit, I have become a little cautious and wonder which brushes fit the "ProtectiveClean 4300". The "ProtectiveClean" line is not listed in the brush compatibility lists. The reference here to the type "HX6054" does not give any search result. The Philips support page shows the type "HX9064/33", but unfortunately I can't find this type designation either.