Janey; I looked through the manual and it shows the 'plates' that were in a drawer, like you listed.
The bobbin is unique to say the least, comes apart to remove left over thread.
Interesting feature on the machine, is the in-place-bobbin winding. Wonder why that idea is not used more often now.
Am hoping to find someone who can use these items, for postage, as the only Singer I have is my Featherweight.
I am not a collector of machines.