For the EP912STI I did the 914 FWF kit, and just removed what was not needed. Actually the 912 FWF would work also. (Motor mounts are the same for both I think but make sure to confirm) Fuel lines and intake ducting, naca vents, throttle cable will all need to be sourced, but not hard to do. The EP 35 amp alternator is great. In your pictures you can see it in the top picture. It hooks to the flywheel and the flywheel housing is extended. Not sure the weight probably a few pounds. Like Brian said you need to remove the cross member on the motor mount so the housing will clear. The cross member is there to help support the nose wheel. If you doing tricycle gear I would go with the 15 amp because you want that support for nosegear, but if your going tailwheel I would go 35 amp. The stock one stays inside the flywheel and this attaches aft. I run 35 amp as primary and the 18 amp as a backup. If I go to 18amp backup I will need to load shed some to stay under limits but it will get me back home fine.