These cups fit these model number blenders. (The model number is located underneath the base of the blender and must start with a BL) : BL660 (1100 watt), BL663 (1100 watt), BL740, BL770 BL771 BL772 (1500 watt), BL780 (12...

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These cups fit these model number blenders. (The model number is located underneath the base of the blender and must start with a BL) : BL660 (1100 watt), BL663 (1100 watt), BL740, BL770 BL771 BL772 (1500 watt), BL780 (1200 watt), BL810 BL820 BL830
You need make sure before buying that the cups you are replacing have "4 TABS"