I am running IGMP V2 and Sparse mode multicast. Do i need an RP or not.?

Hi All,i am going through a project to replace all of my air-lap1242ag-e-k9 WAP's with AIR-SAP1602E-AK9-5's.Does anyone know if the AIR-SAP1602E-AK9-5 can use the same mounting bracket as the air-lap1242ag-e-k9 or can anyone point me in the right dir...