I have not seen them online, however, I was just doing some clean up and came across the replacement parts order form for the NJ-1200. Call 800-822-1100x0. You want part # 00.40.004, Triple Suction Cup support - all models ($3.90 ea) and pn 00.40.001 Rubber Suction cups. That is used for the submersible option.
If you want to hook it to the tank rim you need 00.40.005 Adjustable Hook with guide ($6.40). PM me it if this is what you need. I use mine with the 3x cup support so I have the brackets hang-on brackets available.