Hello, Model 104SM is our Silent Master S2 which uses our HyperFlow Filter bags (#720HF-5).
Hi Dianna, congratulations on the home and the central vac! Getting it filtered and running with good accessories will make cleaning easier than ever. The Star units used a variety of bags including this one depending on the design of the unit. If top emptying then it may be this one. Here are other choices https://builtinvacuum.com/help/star/motor.html. Please call us for further help. Enjoy!