OMC OEM Is best but these work fine harmonic pullers 
notice the inverted nylon nuts .. they make sure the bolt are not inserted to deep in the FW so as to hit coils and parts.. but just enough.
They also keep the bolts in place so you don’t loose them 🙂 that pointy tip is held by a oring… carefull not to loose the tip !!
Joining AOMCI has priviledges 🙂