Many things can be said about the Singer Sewing Machine Company but my experience is that they support their products way back to the first sewing machine Eve ever owned. Granted, parts for the really old ones get a little thin on the ground but.... So, I suggest you get on the Internet look up the sewing machine company and either give them a call or email them and find out where their parts and service centers are located. Give them a call or email; tell them the pieces you looking for and for what machine; and they will have your order in your hands in just about a work week.
If you really get stuck, the ladies and gentlemen in the vintage area of this site are absolutely wizards at finding bits and pieces so you might try them. Good luck and please let us know how it turns out.
Thanks,
Pat