replacement diffuser, 2 x 4
I have a lay-in troffer in my home that has a boxed, plastic diffuser. I would like to replace the diffuser. It mounts on 4 metal tabs punched and bent from the troffer frame that are near the corners on the long sides. To remove the diffuser, you push in on the plastic near the tabs and catch it before it slips off the tabs on the other side. Is there any hope of finding a replacement?
I have seen some replacement diffusers on web sites. Most are being marketed as parts of lighting upgrade kits may be somewhat universal wrt mounting to recessed troffers, and most seem to be sold in large quantities. Can anything like this be found at a local supplier at a reasonable price?