Mark 58 - Merc 500 Leg on a later model Merc 500 clamp assembly.  Now you can run a modern rotary steering system.  Top cowl has threaded holes for electric choke.  Lower cowl is electric start type, currently has a block off plate.  Ready for your powerhead and gear case.  All parts repainted.  New parts include:  upper mounts; U cups, end caps, reverse push rod; (2) thumb screws and pads; NOS water tube, not installed.  It has the MK50 wrap-a-round, nice but has some dents.  I have the correct wrap-a-round, not perfect but nice.