I have a mid 80's (I think?) Ryobi built copy of a Singer DCL series canister that is branded Kenmore. It seems like everything for them is NLA now. Finding bags, filters and any parts takes patience and the ability to cultivate various on line sellers and your local vacuum shop(s). Everyone who matters has to know what you have and what you are looking for. The more eyes and the more dusty forgotten parts bins the better.
Good luck. Post up photos of your soon.