Mike, Nice install looks good. On the bolts it just comes down to being an EME made starter. The EME 35 uses the bigger diameter bolts (M5) so it makes sense that they would use the same bolt size for the starter. If it were a DLE made starter the smaller diameter bolt would make sense.
Some general FYI for folks reading about the starter. Some sticky grease on the gears is an absolute must!!! Never run it with out a prop installed it needs a load or the gear teeth can and probably will chip or disappear faster then you can say, abracadabra. As Mike said the bolt pattern is the same but the EME uses a bigger diameter bolt so DLE users will need to chase the existing DLE holes for the bigger bolt. The optional EME controller has a fail safe where it cuts power to the starter after 1.5 seconds, this prevents the gas motor from creating carnage in case the switch is left on. However brushed ESC's, servo operated switches, relays, etc.. are all good choices as well so the controller is not a required item.
I have been a member here for 9-10 years... Just now getting around to my first post... What a slacker..