If u go to seikis project thread and urll see on the first page the first few pics of his engine in bits u can see the kickstart components still in the casing,
You'll need the kick start, kick start mechanism, and the seal to go in the side casing. Well worth it IMO, trying to start my RE up from after 3 months was proving quite difficult with the kick start, so I'd hate to imagine how much pain my ears would have to go through if i was using the electric start!
I'm almost certain someone was selling all the lot on eBay for around £30, not too bad if you ask me. I went to a guy local to me and tried charging me £20 for the mechanism alone!
In fact I've just remembered i also had to add another gear to the inside of the engine under the clutch, i think they call it an idle gear. You will also need that and some sort of clip that i have forgot the name of to lock that gear into place.. I'll try and find a listing and edit if i find one..