Mercury Kiekhaefer Outboard Mark 30 Retaining Ring Dyna Float Mounts 23720 23721 Complete Upper & Lower Gearcases This one is stamped 70126

This one is stamped 70126

Michigan Wheel 031064

Also Some of the 80's 140hp models had the Throttle Bracket built into the valve cover and this is not compatible with those models

UPS Shipping so you get it in a reasonable time frame

1500 150hp (not specifically mentioned

Mercury Kiekhaefer Outboard Mark 30 Retaining Ring Dyna Float Mounts 23720 23721 Complete Upper & Lower Gearcases This one is stamped 70126This 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