I would like to replace the grills on my Century L-100 speakers. I purchased these babies in 1975 and they have been outstanding every day since. The original grills were Quadrex ultra blue. I found a couple companies that apparently make them, but I am unable to contact them for whatever reason. One was Sculpted Foam Innovations ( saw their product on e-Bay, no longer available ), and the other was Foam Trend. Would truly appreciate any help or advice on the subject.