It may actually need these two parts for the muzzle.
http://www.e-sarcoinc.com/erma22knur...trear8903.aspx
http://www.e-sarcoinc.com/erma22lock...cknut8905.aspx
The ejection system on your early kit is the same as the last ones Erma made, the SE 08/2, the model Rich posted the parts diagram for. It should have a separate ejector compatible with the kit. For the kit to eject when installed and used, you'll need one of those, a modified one from the P.08, or a mag from the SE 08 kit made in between the early and /2. These mags have an extended right rear feed lip that sticks up and functions as the ejector. One of these mags in nice shape usually commands a hundred bucks or a little more, but I think it's the easiest way to deal with the situation. You may wait forever to encounter an original replacement ejector, and making one may eat up more shop time in designing the copy, making one, and tuning it to work, than is reasonable.
I have some spare muzzle nuts, but no spare locking washer, so picking both of them up from Sarco would be your best deal. I have an extra SE 08 mag. It has a streak of missing finish, due to something unknown dribbled on it in the past, which I'd pass on for $95 plus shipping in a small flat rate box. $50 insurance is automatically included, along with tracking, but if you want extra ins., add that in, too. If you're interested, give a holler!