75 mariner short mid

[75luva]

A mate here in Australia has this mid
Wondering what mid it is as cant find anything about a 750x or xs mariner
What is the chance of getting the correct gearcase for this midsection

[75luva]

The gearbox in pictures one he found that bolts up but from a different engine

[25XS]

It takes a Speedmaster looking gearcase... It's a 650X tower & clamp assembly based on this old post: http://www.boatracingfacts.com/forums/showthread.php?17586-Mercury-650XS