Allied Moulded offers a complete line of SLIDERBOX products in both new and old work applications including:
– Single, Two, Three, and Four Gang Wall Boxes
– 4″ Paddle Fan and Fixture Support Boxes
– 4″ Round Outlet/Ceiling Boxes
– Low Voltage Partition
– Horizontal Mount Box
https://www.alliedmoulded.com/residential/sliderbox/