*website name removed* says they will fit the Thor M2/H2s but not first generation Thors. I don't have a Thor M2/H2 to verify this.
The Sanwu star caps and their beam expander also fit on those cheap ebay Model 900s (only the focusable ones), but not Model 920s, 303s, or unfocusable Model 900s. Those I've verified.