Hi and welcome,
The crème enhancing disc that you seek is the antithesis of the Coffee Snob modus operandi! These only produce fake crème and allow the user to use variably ground and stale coffee: to producing reasonably looking poor tasting eXpresso [sic]! Good espresso relies on the quality of the grind more so than the device for extraction (chicken and egg theory). Be happy that you lost the rubber disc of mediocrity, source or use your good quality espresso grinder and start creating real espresso... and welcome!