Omc/ Mercruiser swap

I don't know if this can help........
Outdrive Coupler Alignment Tool for Mercruiser, OMC Cobra & Volvo SX P/N 91-8054 | eBay

You might try posting in the Iboats forum...........
Boating Forum - iboats Boating Forums

Much less traffic here but ya' never know.....
Boat Repair Forum (marineengine.com)