Bell Housing Bolt Part # or Bolt Size AHU Engine

Does anyone out there know what the Part Number size the bell housing bolts would be on an AHU engine with a manual transmission? I bought an engine and transmission separate and the bell housing bolts didn't come with either of them, and I can't seem to find this information anywhere online so I need help.

Not sure on the AHU, I'm assuming it's similar to the others but an M12x1.75 bolt should work, not sure on length though, maybe 70mm?