http://www.ismacs.net/singer_sewing_...-database.html
This link is for the ISMACS site. It will give you the allotment dates and model numbers, etc.
http://www.sew-classic.com/
Check out Sew Classic for the belts you need.
Wonderful collection of goodies and an ORIGINAL oil can, awesome. Enjoy your new girls. I don't have a Singer 99, YET.