The black Dominion has a throat and slide plate. I took them off to get a better picture of the bobbin area. No, there are no more parts for this machine in that bag. There was a bobbin case, but it has a left (11:00 oclock) facing finger, so not for this machine.
I will be contacting Glen about the Featherweight bobbin case for the 301. Thanks for that tip.
Miriam is also looking for parts for the 15 clone. I'm not sure if I want to get it running, but if you could pm me the prices I can let you know. Thanks very much.