Mercury Kiekhaefer Outboard Mark 30 Retaining Ring Dyna Float Mounts 23720 23721 Distributor Ignition Parts and you will either need

and you will either need to replace the wire

so i believe the back half of this is just a piece of metal that was fabricated to work with the original front handle half

5L 1963 1964 1965 1966 1967 1968 110hp 120hp 4cyl 150 6cyl

The pilot light might be / probably is broken on this

Mercury Kiekhaefer Outboard Mark 30 Retaining Ring Dyna Float Mounts 23720 23721 Distributor Ignition Parts and you will either needThis is Off a Mercury 1956 Mark 30 1 4 cylinder Turbo Four (serial # 994104) May work with 1957 or 1958 Item Condition: Good Working Condition Part#'s Cover Retaining Ring Upper (Small) 53 23720 Cover Retaining Ring Lower (Big) 53 23721 Other Related Models: Mark 30, Mark 30 1, Mark 30 2, Mark 30 3, Mark 30E, Mark 30E 1 Mark 30 2, Mark 30, Mark 30H 950250 and below, 984920 thru 102598, 1031987 thru 1163545, 1163546 and upars Years: 1956, 1957, 1958