The Coralife Compact Fluorescent NEW STYLE Lunar Aqualight Replacement Mounting Legs only work with the NEW STYLE Compact Fluorescent Lunar Aqualight. The NEW STYLE fixture has two mounting legs. You can use the Coralife Aqualight Clear Mounting Legs for the OLD STYLE Lunar Aqualight fixture (which has four legs). These legs will also NOT work with the T5 Lunar Aqualight.