Tecumseh engines with 6 H P for models 912010 and 912011 along with 8 HP for model 912012 are used which means Ariens 912 series has the danfoss and rangeberg engines.
The measurement of the cutter width is 26 inches for models 912010 and 912011 while that of model 912012 is 28 inches wide.
Yes, there are numerous attachments that can be used with Ariens 912 Mower and include bagger vacs among others.
Your nearest approved Ariens Dealer has the best to offer in terms of replacement components.
Indeed, the mower includes safety features, notably a seat switch to prevent the machine from functioning while unattended.