This machine has a rectangular base with squared off corners, not rounded corners as most other machines. I don't know if the base length/width are the same as most other machines. Also the hinge pins are not the same distance as most other machines.
I had one here
New Home Treadle Update, thanks to OurWorkbench and Mickey2!
but obviously the table is occupied, but I guess there might be one out there somewhere.
Here's what to do:
1. get a new power block as linked by Janey
2. Once you have the power block take the motor to a hardware store with the power block and ask them to put on a new plug for you which works in "motor" socket; they could test it right there for you.
3. check all your needles against the decal; get some 206x13 needles and see if they match the decal
4. keep checking ebay for CC1221 needles
5. Try what I suggested about bobbins up above
6. Keep an eye on craigslist and facebook market place for machines with that decal on the base, looking for extra needles and bobbins