We have a 1950's bathroom fluorescent light fixture/mirror medicine cabinet. The lights are on either side of the mirror and have yellowing, brittle diffusers. My son recently broke one of the diffusers. The lighting stores I have been to only offer the option of buying the entire medicine cabinet or the electrical light portion. I just want a new diffuser because the mirror is in excellent condition and the light fixture works fine. They are flat on the outsides and then curve inward until they meet the mirror. Any help finding dealers of old style light covers/diffusers or ****** resources would be great.