What CAMS are used with the SPSL? December 16, 2014 00:39 Updated Answer The C4 for latch only functions; the C258 for deadbolt functions. Applies To SPSL Additional Information Related articles Commercial Hardware Mortise Cylinder Configurations for BEST 45 H and 45HW SPSL Parts Are there other functions for the SPSL cylindrical locks? What is the part number # for the 9K throw member/spacer? What cam is used on the Best 40/45H mortise lock?