Does anybody have access to a 129 manual so that they could tell me what parts to remove in order to get the new motor mounts out/in? Undoing the mounting screws is simple but the parts will not come out without removing something else to make space to remove the parts.

Some tricks are to only jack up one side at a time, just be careful that you don't jam the engine fan into the shroud or crunch any wires / hoses. You might have to unlock the fan shroud ring to gain clearance.

If that does not get you enough room, you will have to remove the aluminum mount to engine bracket. ( 4 bolts ) Also, take the shifter out of park as the linkage will be moving when you jack up then engine. Check linkage adjustment when you are finished too.