Customer Reviews for Progress Lighting 4-Light White Fluorescent Fixture

I bought 2 of these ceiling fluorescent 4 T8 tube lamps with the curved wrap over diffuser. One of the 4 clips that holds the diffuser to the stamped steel base is missing causing the cover to sag. The stores do not carry spares. How do I get one of these extruded plastic clips?

I purchased both the 4 bulb long unit for my kitchen and the 4 bulb half length unit for the adjacent dining nook. After 10 years both acrylic covers have aged, become brittle and shattered. I will have to replace both fixtures because it's impossible to buy replacement diffusers. Ceiling fixtures should last longer than 10 years.