Serial #: G6559048 is a 127, one of 25,000 allotted 12-11-18.
I can only suggest one place for a face plate: http://thayerrags.com/ They are members here and I've done business with them. Ask for CD.
Yes, they have many many different feet and attachments for those machines. I think, but am not positive, they use standard low shank feet and attachments. I'm sure there is someone here how can answer your question definitively.
If nothing else try the feet and attachments from the model 66 you just bought.
Serial #: AA916206 is a 66, one of 50,000 allotted 1-26-26.
It should have red eye decals on it. Be VERY careful how you clean the surface of that machine. Those decals will be very prone to silvering and being removed by overly agressive cleaning. Don't ask me how I know that. There is two tutorial threads here that show how to clean and protect these old machines.
The first one is a sticky at the top:
How to Clean Up and use a vintage sewing machine - videos by Muv and Fav
The second one should be:
Cleaning and repairing the Shellac clear coat on Vintage sewing machine heads